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        "nc-senate-2023-group-10",
        "nc-senate-2023-group-11",
        "nc-senate-2023-group-13",
        "nc-senate-2023-group-19",
        "nc-senate-2023-group-20",
        "nc-senate-2023-group-23",
        "nc-senate-2023-group-24",
        "nc-senate-2023-group-25",
        "nc-senate-2023-group-26",
        "nc-senate-2023-group-30",
        "nc-senate-2023-group-33",
        "nc-senate-2023-group-37",
        "nc-senate-2023-group-45",
        "nc-senate-2020-a2-group-1",
        "nc-senate-2020-a2-group-2",
        "nc-senate-2020-a2-group-3",
        "nc-senate-2020-b2-group-1",
        "nc-senate-2020-b2-group-2",
        "nc-senate-2020-c1-group-1",
        "nc-senate-2020-c1-group-2",
        "nc-senate-2023-group-2",
        "nc-senate-2023-group-1"
      ],
      "isAdopted2023": false,
      "groupCount": 26,
      "districtCount": 50,
      "countyCount": 100,
      "population": 10439388,
      "minimumTraversals": 74
    },
    {
      "id": "A2-B2-C2-D1",
      "label": "A2 \u00b7 B2 \u00b7 C2 \u00b7 D1",
      "choices": {
        "A": "A2",
        "B": "B2",
        "C": "C2",
        "D": "D1"
      },
      "groupIds": [
        "nc-senate-2023-group-3",
        "nc-senate-2023-group-4",
        "nc-senate-2023-group-5",
        "nc-senate-2023-group-6",
        "nc-senate-2023-group-10",
        "nc-senate-2023-group-11",
        "nc-senate-2023-group-13",
        "nc-senate-2023-group-19",
        "nc-senate-2023-group-20",
        "nc-senate-2023-group-23",
        "nc-senate-2023-group-24",
        "nc-senate-2023-group-25",
        "nc-senate-2023-group-26",
        "nc-senate-2023-group-30",
        "nc-senate-2023-group-33",
        "nc-senate-2023-group-37",
        "nc-senate-2023-group-45",
        "nc-senate-2020-a2-group-1",
        "nc-senate-2020-a2-group-2",
        "nc-senate-2020-a2-group-3",
        "nc-senate-2020-b2-group-1",
        "nc-senate-2020-b2-group-2",
        "nc-senate-2023-group-9",
        "nc-senate-2023-group-7",
        "nc-senate-2020-d1-group-1",
        "nc-senate-2020-d1-group-2"
      ],
      "isAdopted2023": false,
      "groupCount": 26,
      "districtCount": 50,
      "countyCount": 100,
      "population": 10439388,
      "minimumTraversals": 74
    },
    {
      "id": "A2-B2-C2-D2",
      "label": "A2 \u00b7 B2 \u00b7 C2 \u00b7 D2",
      "choices": {
        "A": "A2",
        "B": "B2",
        "C": "C2",
        "D": "D2"
      },
      "groupIds": [
        "nc-senate-2023-group-3",
        "nc-senate-2023-group-4",
        "nc-senate-2023-group-5",
        "nc-senate-2023-group-6",
        "nc-senate-2023-group-10",
        "nc-senate-2023-group-11",
        "nc-senate-2023-group-13",
        "nc-senate-2023-group-19",
        "nc-senate-2023-group-20",
        "nc-senate-2023-group-23",
        "nc-senate-2023-group-24",
        "nc-senate-2023-group-25",
        "nc-senate-2023-group-26",
        "nc-senate-2023-group-30",
        "nc-senate-2023-group-33",
        "nc-senate-2023-group-37",
        "nc-senate-2023-group-45",
        "nc-senate-2020-a2-group-1",
        "nc-senate-2020-a2-group-2",
        "nc-senate-2020-a2-group-3",
        "nc-senate-2020-b2-group-1",
        "nc-senate-2020-b2-group-2",
        "nc-senate-2023-group-9",
        "nc-senate-2023-group-7",
        "nc-senate-2023-group-2",
        "nc-senate-2023-group-1"
      ],
      "isAdopted2023": false,
      "groupCount": 26,
      "districtCount": 50,
      "countyCount": 100,
      "population": 10439388,
      "minimumTraversals": 74
    }
  ],
  "provenance": {
    "sourceTitle": "NC General Assembly County Clusterings from the 2020 Census",
    "sourceAuthors": [
      "Christopher Cooper",
      "Blake Esselstyn",
      "Gregory Herschlag",
      "Jonathan Mattingly",
      "Rebecca Tippett"
    ],
    "sourcePublished": "2021-08-17",
    "sourceUrl": "https://sites.duke.edu/quantifyinggerrymandering/files/2021/08/countyClusters2020.pdf",
    "sourcePdfSha256": "29c9baca144885e9e56990f0fbe8bddbcf9f2c63e296ad095f6fc30f95df62aa",
    "sourcePdfBytes": 3850232,
    "sourcePdfLastModified": "Tue, 17 Aug 2021 21:33:56 GMT",
    "announcementUrl": "https://sites.duke.edu/quantifyinggerrymandering/2021/08/17/north-carolinas-2020-county-clusters-for-the-general-assembly/",
    "tables": {
      "alternatives": {
        "table": 1,
        "pdfPage": 6
      },
      "fixed": {
        "table": 3,
        "pdfPage": 8
      }
    },
    "retrievedAt": "2026-11-11T05:04:25.917484+00:00",
    "adoptedReferenceFile": "official-senate-grouping.json",
    "adoptedReferenceSha256": "bcf60fc23f38eabaf377beb5e1a7359b89586f18be228f5a5223bb29a9828215",
    "adoptedSourceUrl": "https://www.ncleg.gov/EnactedLegislation/Statutes/HTML/BySection/Chapter_120/GS_120-1.html",
    "populationCrossCheck": "Every published group population matches the sum of current app county aggregates from official 2020 Census block allocations.",
    "identifiers": "countyIds are NCSBE/app IDs, not FIPS. County names are case-insensitive matches; app Mcdowell equals report McDowell.",
    "westernReconciliation": {
      "groupId": "nc-senate-2023-group-45",
      "countyCount": 17,
      "seats": 3,
      "population": 642393,
      "adoptedDistricts": [
        45,
        47,
        50
      ],
      "explanation": "One fixed group in Table3. The three adopted districts are subdivisions inside that group, linked through split Caldwell and Haywood counties. They are not three different county groups. Buncombe/Burke/McDowell and Henderson/Polk/Rutherford belong to the separate variable A region."
    }
  },
  "validation": {
    "uniqueGroups": 35,
    "fixedGroups": 17,
    "fixedSeats": 36,
    "binaryRegions": 4,
    "combinations": 16,
    "eachCombinationGroups": 26,
    "eachCombinationCounties": 100,
    "eachCombinationSeats": 50,
    "eachCombinationPopulation": 10439388,
    "eachCombinationMinimumTraversals": 74,
    "adoptedExactMatch": true,
    "allPublishedGroupPopulationsMatchAppCountyTotals": true,
    "allUniqueGroupsAtomConnected": true,
    "atomCount": 2632
  },
  "scope": "The 16 alternatives exhaust the combinations listed in the cited 2020 Census study, not independently recomputed legal or Voting Rights Act determinations. Each candidate district plan still requires hard population, fixed selected-group boundaries, atom contiguity and traversal validation. Search failure must not relax constraints."
}