{
 "schema_version": "0.2",
 "name": "[[356,13,11]] reduction of [[364,13,11]]",
 "code_type": "CSS",
 "n": 356,
 "k": 13,
 "checks": {
  "X": [
   [
    7,
    19,
    170,
    171,
    192
   ],
   [
    8,
    20,
    171,
    172,
    193
   ],
   [
    9,
    21,
    172,
    173,
    194
   ],
   [
    10,
    22,
    173,
    174,
    195
   ],
   [
    11,
    23,
    174,
    175,
    196
   ],
   [
    12,
    24,
    175,
    176,
    197
   ],
   [
    13,
    25,
    176,
    177,
    198
   ],
   [
    14,
    26,
    177,
    199
   ],
   [
    0,
    18,
    31,
    179,
    205
   ],
   [
    1,
    19,
    32,
    179,
    180,
    206
   ],
   [
    2,
    20,
    33,
    180,
    181,
    207
   ],
   [
    3,
    21,
    34,
    181,
    182,
    208
   ],
   [
    22,
    35,
    182,
    183,
    209
   ],
   [
    4,
    23,
    36,
    183,
    184,
    210
   ],
   [
    24,
    37,
    184,
    185,
    211
   ],
   [
    5,
    25,
    38,
    185,
    186,
    212
   ],
   [
    26,
    39,
    186,
    187,
    213
   ],
   [
    27,
    40,
    187,
    188,
    214
   ],
   [
    28,
    41,
    188,
    189,
    215
   ],
   [
    8,
    31,
    44,
    218
   ],
   [
    9,
    32,
    45,
    190,
    219
   ],
   [
    10,
    33,
    46,
    190,
    191,
    220
   ],
   [
    11,
    34,
    47,
    191,
    192,
    221
   ],
   [
    12,
    35,
    48,
    192,
    193,
    222
   ],
   [
    13,
    36,
    49,
    193,
    194,
    223
   ],
   [
    14,
    37,
    50,
    194,
    195,
    224
   ],
   [
    15,
    38,
    51,
    195,
    196,
    225
   ],
   [
    16,
    39,
    52,
    196,
    197,
    226
   ],
   [
    17,
    40,
    53,
    197,
    198,
    227
   ],
   [
    20,
    44,
    56,
    202,
    203,
    231
   ],
   [
    21,
    45,
    57,
    203,
    204,
    232
   ],
   [
    22,
    46,
    58,
    204,
    205,
    233
   ],
   [
    23,
    47,
    59,
    205,
    206,
    234
   ],
   [
    24,
    48,
    60,
    206,
    207,
    235
   ],
   [
    25,
    49,
    61,
    207,
    208,
    236
   ],
   [
    26,
    50,
    62,
    208,
    209,
    237
   ],
   [
    27,
    51,
    63,
    209,
    210,
    238
   ],
   [
    28,
    52,
    64,
    210,
    211,
    239
   ],
   [
    29,
    53,
    65,
    211,
    212,
    240
   ],
   [
    30,
    54,
    66,
    212,
    213,
    241
   ],
   [
    34,
    57,
    70,
    216,
    217,
    246
   ],
   [
    35,
    58,
    71,
    217,
    218,
    247
   ],
   [
    36,
    59,
    72,
    218,
    219,
    248
   ],
   [
    37,
    60,
    73,
    219,
    220,
    249
   ],
   [
    38,
    61,
    74,
    220,
    221,
    250
   ],
   [
    39,
    62,
    75,
    221,
    222,
    251
   ],
   [
    40,
    63,
    76,
    222,
    223,
    252
   ],
   [
    41,
    64,
    77,
    223,
    224,
    253
   ],
   [
    42,
    65,
    78,
    224,
    225,
    254
   ],
   [
    43,
    66,
    79,
    225,
    226,
    255
   ],
   [
    46,
    69,
    82,
    228,
    229,
    259
   ],
   [
    47,
    70,
    83,
    229,
    230,
    260
   ],
   [
    48,
    71,
    84,
    230,
    231,
    261
   ],
   [
    49,
    72,
    85,
    231,
    232,
    262
   ],
   [
    50,
    73,
    86,
    232,
    233,
    263
   ],
   [
    51,
    74,
    87,
    233,
    234,
    264
   ],
   [
    52,
    75,
    88,
    234,
    235,
    265
   ],
   [
    53,
    76,
    89,
    235,
    236,
    266
   ],
   [
    54,
    77,
    90,
    236,
    237,
    267
   ],
   [
    55,
    78,
    91,
    237,
    238,
    268
   ],
   [
    58,
    82,
    95,
    242,
    243,
    272
   ],
   [
    59,
    83,
    96,
    243,
    244,
    273
   ],
   [
    60,
    84,
    97,
    244,
    245,
    274
   ],
   [
    61,
    85,
    98,
    245,
    246,
    275
   ],
   [
    62,
    86,
    99,
    246,
    247,
    276
   ],
   [
    63,
    87,
    100,
    247,
    248,
    277
   ],
   [
    64,
    88,
    101,
    248,
    249,
    278
   ],
   [
    65,
    89,
    102,
    249,
    250,
    279
   ],
   [
    66,
    90,
    103,
    250,
    251,
    280
   ],
   [
    67,
    91,
    104,
    251,
    252,
    281
   ],
   [
    68,
    92,
    105,
    252,
    253,
    282
   ],
   [
    71,
    95,
    108,
    256,
    257,
    285
   ],
   [
    72,
    96,
    109,
    257,
    258,
    286
   ],
   [
    73,
    97,
    110,
    258,
    259,
    287
   ],
   [
    74,
    98,
    111,
    259,
    260,
    288
   ],
   [
    75,
    99,
    112,
    260,
    261,
    289
   ],
   [
    76,
    100,
    113,
    261,
    262,
    290
   ],
   [
    77,
    101,
    114,
    262,
    263,
    291
   ],
   [
    78,
    102,
    115,
    263,
    264,
    292
   ],
   [
    79,
    103,
    116,
    264,
    265,
    293
   ],
   [
    80,
    104,
    117,
    265,
    266,
    294
   ],
   [
    81,
    105,
    118,
    266,
    267,
    295
   ],
   [
    84,
    108,
    121,
    269,
    270,
    299
   ],
   [
    85,
    109,
    122,
    270,
    271,
    300
   ],
   [
    86,
    110,
    123,
    271,
    272,
    301
   ],
   [
    87,
    111,
    124,
    272,
    273,
    302
   ],
   [
    88,
    112,
    125,
    273,
    274,
    303
   ],
   [
    89,
    113,
    126,
    274,
    275,
    304
   ],
   [
    90,
    114,
    127,
    275,
    276,
    305
   ],
   [
    91,
    115,
    128,
    276,
    277,
    306
   ],
   [
    92,
    116,
    129,
    277,
    278,
    307
   ],
   [
    93,
    117,
    130,
    278,
    279,
    308
   ],
   [
    94,
    118,
    131,
    279,
    280,
    309
   ],
   [
    98,
    122,
    135,
    283,
    284,
    314
   ],
   [
    99,
    123,
    136,
    284,
    285,
    315
   ],
   [
    100,
    124,
    137,
    285,
    286,
    316
   ],
   [
    101,
    125,
    138,
    286,
    287,
    317
   ],
   [
    102,
    126,
    139,
    287,
    288,
    318
   ],
   [
    103,
    127,
    140,
    288,
    289,
    319
   ],
   [
    104,
    128,
    141,
    289,
    290,
    320
   ],
   [
    105,
    129,
    142,
    290,
    291,
    321
   ],
   [
    106,
    130,
    143,
    291,
    292,
    322
   ],
   [
    107,
    131,
    144,
    292,
    293,
    323
   ],
   [
    110,
    134,
    296,
    297,
    327
   ],
   [
    111,
    135,
    147,
    297,
    298,
    328
   ],
   [
    112,
    136,
    148,
    298,
    299,
    329
   ],
   [
    113,
    137,
    149,
    299,
    300,
    330
   ],
   [
    114,
    138,
    150,
    300,
    301,
    331
   ],
   [
    115,
    139,
    151,
    301,
    302,
    332
   ],
   [
    116,
    140,
    152,
    302,
    303,
    333
   ],
   [
    117,
    141,
    153,
    303,
    304,
    334
   ],
   [
    118,
    142,
    154,
    304,
    305,
    335
   ],
   [
    119,
    143,
    155,
    305,
    306,
    336
   ],
   [
    120,
    144,
    156,
    306,
    307,
    337
   ],
   [
    123,
    310,
    311,
    339
   ],
   [
    124,
    147,
    159,
    311,
    312,
    340
   ],
   [
    125,
    148,
    160,
    312,
    313,
    341
   ],
   [
    126,
    149,
    161,
    313,
    314,
    342
   ],
   [
    127,
    150,
    162,
    314,
    315,
    343
   ],
   [
    128,
    151,
    163,
    315,
    316,
    344
   ],
   [
    129,
    152,
    164,
    316,
    317,
    345
   ],
   [
    130,
    153,
    165,
    317,
    318
   ],
   [
    131,
    154,
    166,
    318,
    319,
    346
   ],
   [
    132,
    155,
    167,
    319,
    320
   ],
   [
    133,
    156,
    168,
    320,
    321
   ],
   [
    7,
    173,
    182
   ],
   [
    0,
    174
   ],
   [
    1,
    175
   ],
   [
    2,
    176
   ],
   [
    3,
    177
   ],
   [
    12,
    187
   ],
   [
    4,
    178
   ],
   [
    14,
    189
   ],
   [
    6,
    172,
    181
   ],
   [
    0,
    8,
    183
   ],
   [
    1,
    9,
    184
   ],
   [
    2,
    10,
    185
   ],
   [
    3,
    11,
    186
   ],
   [
    4,
    13,
    188
   ],
   [
    136,
    324,
    325,
    348
   ],
   [
    137,
    159,
    325,
    326,
    349
   ],
   [
    138,
    160,
    326,
    327,
    350
   ],
   [
    139,
    161,
    327,
    328,
    351
   ],
   [
    140,
    162,
    328,
    329,
    352
   ],
   [
    141,
    163,
    329,
    330,
    353
   ],
   [
    142,
    164,
    330,
    331,
    354
   ],
   [
    143,
    165,
    331,
    332,
    355
   ],
   [
    144,
    166,
    332,
    333
   ],
   [
    145,
    167,
    333,
    334
   ],
   [
    146,
    168,
    334,
    335
   ],
   [
    161,
    162,
    347,
    348
   ],
   [
    163,
    348,
    349
   ],
   [
    164,
    349,
    350
   ],
   [
    165,
    350,
    351
   ],
   [
    166,
    351,
    352
   ],
   [
    167,
    352,
    353
   ],
   [
    168,
    353,
    354
   ],
   [
    169,
    355
   ],
   [
    150,
    338,
    339
   ],
   [
    151,
    339,
    340
   ],
   [
    152,
    340,
    341
   ],
   [
    153,
    341,
    342
   ],
   [
    154,
    342,
    343
   ],
   [
    155,
    343,
    344
   ],
   [
    156,
    344,
    345
   ],
   [
    157,
    345
   ],
   [
    158,
    346
   ],
   [
    15,
    27,
    178,
    200
   ],
   [
    16,
    28,
    178,
    201
   ]
  ],
  "Z": [
   [
    20,
    21,
    172,
    181,
    203
   ],
   [
    21,
    22,
    173,
    182,
    204
   ],
   [
    0,
    22,
    23,
    174,
    183,
    205
   ],
   [
    1,
    23,
    24,
    175,
    184,
    206
   ],
   [
    2,
    24,
    25,
    176,
    185,
    207
   ],
   [
    3,
    25,
    26,
    177,
    186,
    208
   ],
   [
    4,
    27,
    28,
    178,
    188,
    210
   ],
   [
    5,
    29,
    30,
    212
   ],
   [
    6,
    33,
    34,
    181,
    191,
    216
   ],
   [
    7,
    34,
    35,
    182,
    192,
    217
   ],
   [
    8,
    35,
    36,
    183,
    193,
    218
   ],
   [
    9,
    36,
    37,
    184,
    194,
    219
   ],
   [
    10,
    37,
    38,
    185,
    195,
    220
   ],
   [
    11,
    38,
    39,
    186,
    196,
    221
   ],
   [
    12,
    39,
    40,
    187,
    197,
    222
   ],
   [
    13,
    40,
    41,
    188,
    198,
    223
   ],
   [
    14,
    41,
    42,
    189,
    199,
    224
   ],
   [
    15,
    42,
    43,
    200,
    225
   ],
   [
    18,
    46,
    47,
    191,
    205,
    229
   ],
   [
    19,
    47,
    48,
    192,
    206,
    230
   ],
   [
    20,
    48,
    49,
    193,
    207,
    231
   ],
   [
    21,
    49,
    50,
    194,
    208,
    232
   ],
   [
    22,
    50,
    51,
    195,
    209,
    233
   ],
   [
    23,
    51,
    52,
    196,
    210,
    234
   ],
   [
    24,
    52,
    53,
    197,
    211,
    235
   ],
   [
    25,
    53,
    54,
    198,
    212,
    236
   ],
   [
    26,
    54,
    55,
    199,
    213,
    237
   ],
   [
    27,
    55,
    200,
    214,
    238
   ],
   [
    28,
    201,
    215,
    239
   ],
   [
    31,
    58,
    59,
    205,
    218,
    243
   ],
   [
    32,
    59,
    60,
    206,
    219,
    244
   ],
   [
    33,
    60,
    61,
    207,
    220,
    245
   ],
   [
    34,
    61,
    62,
    208,
    221,
    246
   ],
   [
    35,
    62,
    63,
    209,
    222,
    247
   ],
   [
    36,
    63,
    64,
    210,
    223,
    248
   ],
   [
    37,
    64,
    65,
    211,
    224,
    249
   ],
   [
    38,
    65,
    66,
    212,
    225,
    250
   ],
   [
    39,
    66,
    67,
    213,
    226,
    251
   ],
   [
    40,
    67,
    68,
    214,
    227,
    252
   ],
   [
    41,
    68,
    215,
    253
   ],
   [
    44,
    71,
    72,
    218,
    231,
    257
   ],
   [
    45,
    72,
    73,
    219,
    232,
    258
   ],
   [
    46,
    73,
    74,
    220,
    233,
    259
   ],
   [
    47,
    74,
    75,
    221,
    234,
    260
   ],
   [
    48,
    75,
    76,
    222,
    235,
    261
   ],
   [
    49,
    76,
    77,
    223,
    236,
    262
   ],
   [
    50,
    77,
    78,
    224,
    237,
    263
   ],
   [
    51,
    78,
    79,
    225,
    238,
    264
   ],
   [
    52,
    79,
    80,
    226,
    239,
    265
   ],
   [
    53,
    80,
    81,
    227,
    240,
    266
   ],
   [
    56,
    84,
    85,
    231,
    245,
    270
   ],
   [
    57,
    85,
    86,
    232,
    246,
    271
   ],
   [
    58,
    86,
    87,
    233,
    247,
    272
   ],
   [
    59,
    87,
    88,
    234,
    248,
    273
   ],
   [
    60,
    88,
    89,
    235,
    249,
    274
   ],
   [
    61,
    89,
    90,
    236,
    250,
    275
   ],
   [
    62,
    90,
    91,
    237,
    251,
    276
   ],
   [
    63,
    91,
    92,
    238,
    252,
    277
   ],
   [
    64,
    92,
    93,
    239,
    253,
    278
   ],
   [
    65,
    93,
    94,
    240,
    254,
    279
   ],
   [
    69,
    97,
    98,
    245,
    259,
    283
   ],
   [
    70,
    98,
    99,
    246,
    260,
    284
   ],
   [
    71,
    99,
    100,
    247,
    261,
    285
   ],
   [
    72,
    100,
    101,
    248,
    262,
    286
   ],
   [
    73,
    101,
    102,
    249,
    263,
    287
   ],
   [
    74,
    102,
    103,
    250,
    264,
    288
   ],
   [
    75,
    103,
    104,
    251,
    265,
    289
   ],
   [
    76,
    104,
    105,
    252,
    266,
    290
   ],
   [
    77,
    105,
    106,
    253,
    267,
    291
   ],
   [
    78,
    106,
    107,
    254,
    268,
    292
   ],
   [
    82,
    110,
    111,
    259,
    272,
    297
   ],
   [
    83,
    111,
    112,
    260,
    273,
    298
   ],
   [
    84,
    112,
    113,
    261,
    274,
    299
   ],
   [
    85,
    113,
    114,
    262,
    275,
    300
   ],
   [
    86,
    114,
    115,
    263,
    276,
    301
   ],
   [
    87,
    115,
    116,
    264,
    277,
    302
   ],
   [
    88,
    116,
    117,
    265,
    278,
    303
   ],
   [
    89,
    117,
    118,
    266,
    279,
    304
   ],
   [
    90,
    118,
    119,
    267,
    280,
    305
   ],
   [
    91,
    119,
    120,
    268,
    281,
    306
   ],
   [
    95,
    123,
    124,
    272,
    285,
    311
   ],
   [
    96,
    124,
    125,
    273,
    286,
    312
   ],
   [
    97,
    125,
    126,
    274,
    287,
    313
   ],
   [
    98,
    126,
    127,
    275,
    288,
    314
   ],
   [
    99,
    127,
    128,
    276,
    289,
    315
   ],
   [
    100,
    128,
    129,
    277,
    290,
    316
   ],
   [
    101,
    129,
    130,
    278,
    291,
    317
   ],
   [
    102,
    130,
    131,
    279,
    292,
    318
   ],
   [
    103,
    131,
    132,
    280,
    293,
    319
   ],
   [
    104,
    132,
    133,
    281,
    294,
    320
   ],
   [
    105,
    133,
    282,
    295,
    321
   ],
   [
    108,
    136,
    137,
    285,
    299,
    325
   ],
   [
    109,
    137,
    138,
    286,
    300,
    326
   ],
   [
    110,
    138,
    139,
    287,
    301,
    327
   ],
   [
    111,
    139,
    140,
    288,
    302,
    328
   ],
   [
    112,
    140,
    141,
    289,
    303,
    329
   ],
   [
    113,
    141,
    142,
    290,
    304,
    330
   ],
   [
    114,
    142,
    143,
    291,
    305,
    331
   ],
   [
    115,
    143,
    144,
    292,
    306,
    332
   ],
   [
    116,
    144,
    145,
    293,
    307,
    333
   ],
   [
    117,
    145,
    146,
    294,
    308,
    334
   ],
   [
    121,
    148,
    149,
    299,
    313
   ],
   [
    122,
    149,
    150,
    300,
    314,
    338
   ],
   [
    123,
    150,
    151,
    301,
    315,
    339
   ],
   [
    124,
    151,
    152,
    302,
    316,
    340
   ],
   [
    125,
    152,
    153,
    303,
    317,
    341
   ],
   [
    126,
    153,
    154,
    304,
    318,
    342
   ],
   [
    127,
    154,
    155,
    305,
    319,
    343
   ],
   [
    128,
    155,
    156,
    306,
    320,
    344
   ],
   [
    129,
    156,
    157,
    307,
    321,
    345
   ],
   [
    131,
    158,
    309,
    323,
    346
   ],
   [
    134,
    160,
    161,
    313,
    327,
    347
   ],
   [
    135,
    161,
    162,
    314,
    328
   ],
   [
    136,
    162,
    163,
    315,
    329,
    348
   ],
   [
    137,
    163,
    164,
    316,
    330,
    349
   ],
   [
    138,
    164,
    165,
    317,
    331,
    350
   ],
   [
    139,
    165,
    166,
    318,
    332,
    351
   ],
   [
    140,
    166,
    167,
    319,
    333,
    352
   ],
   [
    141,
    167,
    168,
    320,
    334,
    353
   ],
   [
    142,
    168,
    321,
    335,
    354
   ],
   [
    143,
    169,
    322,
    336,
    355
   ],
   [
    56,
    202
   ],
   [
    69,
    228
   ],
   [
    82,
    228,
    242
   ],
   [
    95,
    242,
    256
   ],
   [
    108,
    256,
    269
   ],
   [
    121,
    269
   ],
   [
    134,
    296
   ],
   [
    18,
    19,
    170,
    179
   ],
   [
    18,
    32,
    45,
    179,
    202,
    203
   ],
   [
    18,
    31,
    44,
    202
   ],
   [
    56,
    57,
    203,
    216
   ],
   [
    69,
    70,
    216,
    229
   ],
   [
    82,
    83,
    229,
    243
   ],
   [
    95,
    96,
    243,
    257
   ],
   [
    108,
    109,
    257,
    270
   ],
   [
    121,
    122,
    270,
    283
   ],
   [
    134,
    135,
    283,
    297
   ],
   [
    134,
    147,
    297,
    310,
    311
   ],
   [
    159,
    310,
    311,
    324,
    325
   ],
   [
    19,
    20,
    171,
    180,
    202
   ],
   [
    32,
    33,
    180,
    190
   ],
   [
    45,
    46,
    190,
    204,
    228
   ],
   [
    57,
    58,
    204,
    217,
    242
   ],
   [
    70,
    71,
    217,
    230,
    256
   ],
   [
    83,
    84,
    230,
    244,
    269
   ],
   [
    96,
    97,
    244,
    258
   ],
   [
    109,
    110,
    258,
    271,
    296
   ],
   [
    122,
    123,
    271,
    284,
    310
   ],
   [
    135,
    136,
    284,
    298,
    324
   ],
   [
    147,
    148,
    298,
    312
   ],
   [
    159,
    160,
    312,
    326
   ],
   [
    30,
    241
   ],
   [
    43,
    255
   ],
   [
    68,
    282
   ],
   [
    81,
    295
   ],
   [
    94,
    309
   ],
   [
    107,
    323
   ],
   [
    120,
    337
   ],
   [
    17,
    227
   ],
   [
    29,
    240
   ],
   [
    42,
    254
   ],
   [
    55,
    268
   ],
   [
    67,
    281
   ],
   [
    80,
    294
   ],
   [
    93,
    308
   ],
   [
    106,
    322
   ],
   [
    119,
    336
   ],
   [
    16,
    43,
    201,
    226
   ],
   [
    54,
    81,
    241,
    267
   ],
   [
    66,
    94,
    241,
    255,
    280
   ],
   [
    79,
    107,
    255,
    293
   ],
   [
    92,
    120,
    282,
    307
   ],
   [
    118,
    146,
    295,
    309,
    335
   ]
  ]
 },
 "distance": {
  "d": 11,
  "X": {
   "value": 11,
   "confidence": "upper_bound",
   "witness": [
    40,
    41,
    68,
    145,
    168,
    187,
    189,
    282,
    307,
    321,
    334
   ],
   "witness_provenance": {
    "found_by": [
     "@dorakingx"
    ],
    "date": "2026-10-03",
    "found_at_samples": 20000,
    "survived_samples": 20000000,
    "tool": "gf2_fast RIS ladder (verify/gf2_fast.cpp), both sides searched jointly",
    "seeds": [
     777001,
     777138,
     777001,
     777138,
     777275,
     777412,
     777549
    ]
   }
  },
  "Z": {
   "value": 11,
   "confidence": "upper_bound",
   "witness": [
    55,
    67,
    91,
    99,
    112,
    136,
    245,
    274,
    275,
    276,
    324
   ],
   "witness_provenance": {
    "found_by": [
     "@dorakingx"
    ],
    "date": "2026-10-03",
    "found_at_samples": 4000,
    "survived_samples": 20000000,
    "tool": "gf2_fast RIS in the packaging search; the ladder searched both sides jointly",
    "seeds": [
     7,
     777001,
     777138,
     777001,
     777138,
     777275,
     777412,
     777549
    ]
   }
  }
 },
 "provenance": {
  "authors": [
   "@dorakingx"
  ],
  "construction": "Reduction of the board's codes/364-13-11.json ([[364,13,11]]) by 8 qubits at unchanged k, unchanged check-weight class and unchanged locality class, by one move applied to a fixpoint: graft a qubit away using a low-weight element of the stabilizer ROW SPACE. Let S be an element of the row space of H_X with support T and let a be in T. Replace one generator of the subset summing to S by S itself -- the span is unchanged, that generator being S plus the rest of the subset -- and add S into every other X row meeting a, so that a survives only in S. Then apply the CNOT fan-out from a to T\\{a}, which acts on the check matrices as H_X[:, b] ^= H_X[:, a] and H_Z[:, a] ^= H_Z[:, b] for each b in T\\{a}. Only S still meets a, so the first substitution turns S into the weight-1 stabilizer X_a and leaves every other X row alone; the second zeroes column a of H_Z, because commutation forces every Z row to meet T an even number of times. Qubit a is then disentangled and is deleted: n -> n-1, k unchanged, and the Z rows only LOSE an index, so their weights and support diameters cannot rise. The weight of S separates three regimes, and the difference is entirely in the clearing step R ^= S. |S| = 1: nothing is added anywhere, so the weights, the radius AND THE DISTANCE are all preserved exactly, and no distance search is needed -- this is the row-space form of the weight-1 stabilizer cleanup of Liang, Eberhardt and Chen (arXiv:2504.08887 Sec. III D step 4), which the implementation in research/local2d/boundary_engine.py applies only to literal weight-1 generator ROWS. |S| = 2: R loses a and toggles one other index, so its weight changes by 0 or -2 and can never rise. |S| >= 3: R can grow, so every touched row is checked against the code's weight class and its locality radius, measured in the source's own layout. This generalises the capped merge-graft I introduced with [[454,8,17]], which only ever built S from the generators a single qubit happens to lie in. Here the accepted grafts were |S| = 3: 2, |S| = 4: 1, |S| = 6: 1. Low-weight row-space elements are enumerated as sums of at most three checks with a connected overlap pattern. Every graft with |S| >= 2 was accepted only if k was unchanged and a bit-packed RIS search found nothing lighter than 11, screened once and confirmed twice with independent seeds; those in-loop rungs are a filter, not the evidence. QUBIT POSITIONS ARE THE SOURCE'S: every surviving qubit keeps the coordinate it has in codes/364-13-11.json, so the layout is inherited rather than re-derived, and the reduction only deletes. The surviving qubits' indices into the source numbering are [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]... (full list implied by the coordinates in this file).",
  "references": [
   "arXiv:2504.08887"
  ],
  "date": "2026-10-03",
  "notes": "Derived from codes/364-13-11.json, not an independent construction; the source's authors are @MathysRennela and the reduction is mine. The gate reports no exact duplicate and no WL-equivalent entry. It dominates [[364,13,11]], [[394,13,11]], [[450,12,6]] on (n, k, d, w), which therefore leave the frontier of every cell they share with it. The measured interaction radius is 4, against 3.60555 for the source: unlike the graft and the cleanup, the merge-graft can widen a check, and it is capped by the locality class rather than by the source's own radius, so the reduced code is less local even though it stays in the same cell. Distance is a witness-backed upper bound: the deepest null result is 20000000 fresh-seed RIS trials. Literature novelty is unverified.",
  "model": "Claude Opus 5 (Claude Code)",
  "origin": "submission",
  "novelty": "unknown"
 },
 "family": "bivariate-bicycle",
 "locality": {
  "coordinates": [
   [
    1.0,
    2.0
   ],
   [
    1.0,
    3.0
   ],
   [
    1.0,
    4.0
   ],
   [
    1.0,
    5.0
   ],
   [
    1.0,
    7.0
   ],
   [
    1.0,
    9.0
   ],
   [
    2.0,
    0.0
   ],
   [
    2.0,
    1.0
   ],
   [
    2.0,
    2.0
   ],
   [
    2.0,
    3.0
   ],
   [
    2.0,
    4.0
   ],
   [
    2.0,
    5.0
   ],
   [
    2.0,
    6.0
   ],
   [
    2.0,
    7.0
   ],
   [
    2.0,
    8.0
   ],
   [
    2.0,
    9.0
   ],
   [
    2.0,
    10.0
   ],
   [
    2.0,
    11.0
   ],
   [
    3.0,
    0.0
   ],
   [
    3.0,
    1.0
   ],
   [
    3.0,
    2.0
   ],
   [
    3.0,
    3.0
   ],
   [
    3.0,
    4.0
   ],
   [
    3.0,
    5.0
   ],
   [
    3.0,
    6.0
   ],
   [
    3.0,
    7.0
   ],
   [
    3.0,
    8.0
   ],
   [
    3.0,
    9.0
   ],
   [
    3.0,
    10.0
   ],
   [
    3.0,
    11.0
   ],
   [
    3.0,
    12.0
   ],
   [
    4.0,
    0.0
   ],
   [
    4.0,
    1.0
   ],
   [
    4.0,
    2.0
   ],
   [
    4.0,
    3.0
   ],
   [
    4.0,
    4.0
   ],
   [
    4.0,
    5.0
   ],
   [
    4.0,
    6.0
   ],
   [
    4.0,
    7.0
   ],
   [
    4.0,
    8.0
   ],
   [
    4.0,
    9.0
   ],
   [
    4.0,
    10.0
   ],
   [
    4.0,
    11.0
   ],
   [
    4.0,
    12.0
   ],
   [
    5.0,
    0.0
   ],
   [
    5.0,
    1.0
   ],
   [
    5.0,
    2.0
   ],
   [
    5.0,
    3.0
   ],
   [
    5.0,
    4.0
   ],
   [
    5.0,
    5.0
   ],
   [
    5.0,
    6.0
   ],
   [
    5.0,
    7.0
   ],
   [
    5.0,
    8.0
   ],
   [
    5.0,
    9.0
   ],
   [
    5.0,
    10.0
   ],
   [
    5.0,
    11.0
   ],
   [
    6.0,
    0.0
   ],
   [
    6.0,
    1.0
   ],
   [
    6.0,
    2.0
   ],
   [
    6.0,
    3.0
   ],
   [
    6.0,
    4.0
   ],
   [
    6.0,
    5.0
   ],
   [
    6.0,
    6.0
   ],
   [
    6.0,
    7.0
   ],
   [
    6.0,
    8.0
   ],
   [
    6.0,
    9.0
   ],
   [
    6.0,
    10.0
   ],
   [
    6.0,
    11.0
   ],
   [
    6.0,
    12.0
   ],
   [
    7.0,
    0.0
   ],
   [
    7.0,
    1.0
   ],
   [
    7.0,
    2.0
   ],
   [
    7.0,
    3.0
   ],
   [
    7.0,
    4.0
   ],
   [
    7.0,
    5.0
   ],
   [
    7.0,
    6.0
   ],
   [
    7.0,
    7.0
   ],
   [
    7.0,
    8.0
   ],
   [
    7.0,
    9.0
   ],
   [
    7.0,
    10.0
   ],
   [
    7.0,
    11.0
   ],
   [
    7.0,
    12.0
   ],
   [
    8.0,
    0.0
   ],
   [
    8.0,
    1.0
   ],
   [
    8.0,
    2.0
   ],
   [
    8.0,
    3.0
   ],
   [
    8.0,
    4.0
   ],
   [
    8.0,
    5.0
   ],
   [
    8.0,
    6.0
   ],
   [
    8.0,
    7.0
   ],
   [
    8.0,
    8.0
   ],
   [
    8.0,
    9.0
   ],
   [
    8.0,
    10.0
   ],
   [
    8.0,
    11.0
   ],
   [
    8.0,
    12.0
   ],
   [
    9.0,
    0.0
   ],
   [
    9.0,
    1.0
   ],
   [
    9.0,
    2.0
   ],
   [
    9.0,
    3.0
   ],
   [
    9.0,
    4.0
   ],
   [
    9.0,
    5.0
   ],
   [
    9.0,
    6.0
   ],
   [
    9.0,
    7.0
   ],
   [
    9.0,
    8.0
   ],
   [
    9.0,
    9.0
   ],
   [
    9.0,
    10.0
   ],
   [
    9.0,
    11.0
   ],
   [
    9.0,
    12.0
   ],
   [
    10.0,
    0.0
   ],
   [
    10.0,
    1.0
   ],
   [
    10.0,
    2.0
   ],
   [
    10.0,
    3.0
   ],
   [
    10.0,
    4.0
   ],
   [
    10.0,
    5.0
   ],
   [
    10.0,
    6.0
   ],
   [
    10.0,
    7.0
   ],
   [
    10.0,
    8.0
   ],
   [
    10.0,
    9.0
   ],
   [
    10.0,
    10.0
   ],
   [
    10.0,
    11.0
   ],
   [
    10.0,
    12.0
   ],
   [
    11.0,
    0.0
   ],
   [
    11.0,
    1.0
   ],
   [
    11.0,
    2.0
   ],
   [
    11.0,
    3.0
   ],
   [
    11.0,
    4.0
   ],
   [
    11.0,
    5.0
   ],
   [
    11.0,
    6.0
   ],
   [
    11.0,
    7.0
   ],
   [
    11.0,
    8.0
   ],
   [
    11.0,
    9.0
   ],
   [
    11.0,
    10.0
   ],
   [
    11.0,
    11.0
   ],
   [
    11.0,
    12.0
   ],
   [
    12.0,
    0.0
   ],
   [
    12.0,
    1.0
   ],
   [
    12.0,
    2.0
   ],
   [
    12.0,
    3.0
   ],
   [
    12.0,
    4.0
   ],
   [
    12.0,
    5.0
   ],
   [
    12.0,
    6.0
   ],
   [
    12.0,
    7.0
   ],
   [
    12.0,
    8.0
   ],
   [
    12.0,
    9.0
   ],
   [
    12.0,
    10.0
   ],
   [
    12.0,
    11.0
   ],
   [
    12.0,
    12.0
   ],
   [
    13.0,
    1.0
   ],
   [
    13.0,
    2.0
   ],
   [
    13.0,
    3.0
   ],
   [
    13.0,
    4.0
   ],
   [
    13.0,
    5.0
   ],
   [
    13.0,
    6.0
   ],
   [
    13.0,
    7.0
   ],
   [
    13.0,
    8.0
   ],
   [
    13.0,
    9.0
   ],
   [
    13.0,
    10.0
   ],
   [
    13.0,
    11.0
   ],
   [
    13.0,
    12.0
   ],
   [
    14.0,
    1.0
   ],
   [
    14.0,
    2.0
   ],
   [
    14.0,
    3.0
   ],
   [
    14.0,
    4.0
   ],
   [
    14.0,
    5.0
   ],
   [
    14.0,
    6.0
   ],
   [
    14.0,
    7.0
   ],
   [
    14.0,
    8.0
   ],
   [
    14.0,
    9.0
   ],
   [
    14.0,
    10.0
   ],
   [
    14.0,
    12.0
   ],
   [
    0.0,
    1.0
   ],
   [
    0.0,
    2.0
   ],
   [
    0.0,
    3.0
   ],
   [
    0.0,
    4.0
   ],
   [
    0.0,
    5.0
   ],
   [
    0.0,
    6.0
   ],
   [
    0.0,
    7.0
   ],
   [
    0.0,
    8.0
   ],
   [
    0.0,
    10.0
   ],
   [
    1.0,
    1.0
   ],
   [
    1.0,
    2.0
   ],
   [
    1.0,
    3.0
   ],
   [
    1.0,
    4.0
   ],
   [
    1.0,
    5.0
   ],
   [
    1.0,
    6.0
   ],
   [
    1.0,
    7.0
   ],
   [
    1.0,
    8.0
   ],
   [
    1.0,
    9.0
   ],
   [
    1.0,
    10.0
   ],
   [
    1.0,
    11.0
   ],
   [
    2.0,
    2.0
   ],
   [
    2.0,
    3.0
   ],
   [
    2.0,
    4.0
   ],
   [
    2.0,
    5.0
   ],
   [
    2.0,
    6.0
   ],
   [
    2.0,
    7.0
   ],
   [
    2.0,
    8.0
   ],
   [
    2.0,
    9.0
   ],
   [
    2.0,
    10.0
   ],
   [
    2.0,
    11.0
   ],
   [
    2.0,
    12.0
   ],
   [
    2.0,
    13.0
   ],
   [
    3.0,
    0.0
   ],
   [
    3.0,
    1.0
   ],
   [
    3.0,
    2.0
   ],
   [
    3.0,
    3.0
   ],
   [
    3.0,
    4.0
   ],
   [
    3.0,
    5.0
   ],
   [
    3.0,
    6.0
   ],
   [
    3.0,
    7.0
   ],
   [
    3.0,
    8.0
   ],
   [
    3.0,
    9.0
   ],
   [
    3.0,
    10.0
   ],
   [
    3.0,
    11.0
   ],
   [
    3.0,
    12.0
   ],
   [
    3.0,
    13.0
   ],
   [
    4.0,
    1.0
   ],
   [
    4.0,
    2.0
   ],
   [
    4.0,
    3.0
   ],
   [
    4.0,
    4.0
   ],
   [
    4.0,
    5.0
   ],
   [
    4.0,
    6.0
   ],
   [
    4.0,
    7.0
   ],
   [
    4.0,
    8.0
   ],
   [
    4.0,
    9.0
   ],
   [
    4.0,
    10.0
   ],
   [
    4.0,
    11.0
   ],
   [
    4.0,
    12.0
   ],
   [
    5.0,
    0.0
   ],
   [
    5.0,
    1.0
   ],
   [
    5.0,
    2.0
   ],
   [
    5.0,
    3.0
   ],
   [
    5.0,
    4.0
   ],
   [
    5.0,
    5.0
   ],
   [
    5.0,
    6.0
   ],
   [
    5.0,
    7.0
   ],
   [
    5.0,
    8.0
   ],
   [
    5.0,
    9.0
   ],
   [
    5.0,
    10.0
   ],
   [
    5.0,
    11.0
   ],
   [
    5.0,
    12.0
   ],
   [
    5.0,
    13.0
   ],
   [
    6.0,
    0.0
   ],
   [
    6.0,
    1.0
   ],
   [
    6.0,
    2.0
   ],
   [
    6.0,
    3.0
   ],
   [
    6.0,
    4.0
   ],
   [
    6.0,
    5.0
   ],
   [
    6.0,
    6.0
   ],
   [
    6.0,
    7.0
   ],
   [
    6.0,
    8.0
   ],
   [
    6.0,
    9.0
   ],
   [
    6.0,
    10.0
   ],
   [
    6.0,
    11.0
   ],
   [
    6.0,
    12.0
   ],
   [
    6.0,
    13.0
   ],
   [
    7.0,
    0.0
   ],
   [
    7.0,
    1.0
   ],
   [
    7.0,
    2.0
   ],
   [
    7.0,
    3.0
   ],
   [
    7.0,
    4.0
   ],
   [
    7.0,
    5.0
   ],
   [
    7.0,
    6.0
   ],
   [
    7.0,
    7.0
   ],
   [
    7.0,
    8.0
   ],
   [
    7.0,
    9.0
   ],
   [
    7.0,
    10.0
   ],
   [
    7.0,
    11.0
   ],
   [
    7.0,
    12.0
   ],
   [
    8.0,
    0.0
   ],
   [
    8.0,
    1.0
   ],
   [
    8.0,
    2.0
   ],
   [
    8.0,
    3.0
   ],
   [
    8.0,
    4.0
   ],
   [
    8.0,
    5.0
   ],
   [
    8.0,
    6.0
   ],
   [
    8.0,
    7.0
   ],
   [
    8.0,
    8.0
   ],
   [
    8.0,
    9.0
   ],
   [
    8.0,
    10.0
   ],
   [
    8.0,
    11.0
   ],
   [
    8.0,
    12.0
   ],
   [
    8.0,
    13.0
   ],
   [
    9.0,
    1.0
   ],
   [
    9.0,
    2.0
   ],
   [
    9.0,
    3.0
   ],
   [
    9.0,
    4.0
   ],
   [
    9.0,
    5.0
   ],
   [
    9.0,
    6.0
   ],
   [
    9.0,
    7.0
   ],
   [
    9.0,
    8.0
   ],
   [
    9.0,
    9.0
   ],
   [
    9.0,
    10.0
   ],
   [
    9.0,
    11.0
   ],
   [
    9.0,
    12.0
   ],
   [
    9.0,
    13.0
   ],
   [
    10.0,
    0.0
   ],
   [
    10.0,
    1.0
   ],
   [
    10.0,
    2.0
   ],
   [
    10.0,
    3.0
   ],
   [
    10.0,
    4.0
   ],
   [
    10.0,
    5.0
   ],
   [
    10.0,
    6.0
   ],
   [
    10.0,
    7.0
   ],
   [
    10.0,
    8.0
   ],
   [
    10.0,
    9.0
   ],
   [
    10.0,
    10.0
   ],
   [
    10.0,
    11.0
   ],
   [
    10.0,
    12.0
   ],
   [
    10.0,
    13.0
   ],
   [
    11.0,
    0.0
   ],
   [
    11.0,
    1.0
   ],
   [
    11.0,
    2.0
   ],
   [
    11.0,
    3.0
   ],
   [
    11.0,
    4.0
   ],
   [
    11.0,
    5.0
   ],
   [
    11.0,
    6.0
   ],
   [
    11.0,
    7.0
   ],
   [
    11.0,
    8.0
   ],
   [
    11.0,
    9.0
   ],
   [
    11.0,
    10.0
   ],
   [
    11.0,
    11.0
   ],
   [
    11.0,
    12.0
   ],
   [
    11.0,
    13.0
   ],
   [
    12.0,
    0.0
   ],
   [
    12.0,
    1.0
   ],
   [
    12.0,
    2.0
   ],
   [
    12.0,
    3.0
   ],
   [
    12.0,
    4.0
   ],
   [
    12.0,
    5.0
   ],
   [
    12.0,
    6.0
   ],
   [
    12.0,
    7.0
   ],
   [
    12.0,
    8.0
   ],
   [
    12.0,
    9.0
   ],
   [
    12.0,
    10.0
   ],
   [
    12.0,
    11.0
   ],
   [
    12.0,
    12.0
   ],
   [
    12.0,
    13.0
   ],
   [
    13.0,
    2.0
   ],
   [
    13.0,
    3.0
   ],
   [
    13.0,
    4.0
   ],
   [
    13.0,
    5.0
   ],
   [
    13.0,
    6.0
   ],
   [
    13.0,
    7.0
   ],
   [
    13.0,
    8.0
   ],
   [
    13.0,
    9.0
   ],
   [
    13.0,
    11.0
   ],
   [
    14.0,
    1.0
   ],
   [
    14.0,
    3.0
   ],
   [
    14.0,
    4.0
   ],
   [
    14.0,
    5.0
   ],
   [
    14.0,
    6.0
   ],
   [
    14.0,
    7.0
   ],
   [
    14.0,
    8.0
   ],
   [
    14.0,
    9.0
   ],
   [
    14.0,
    10.0
   ]
  ],
  "interaction_radius": 4.0,
  "layers": 2
 }
}
