{
  "article_id": "LE-US-first-citizens-bank-01",
  "checked_at": "2026-10-11",
  "synthetic_only": true,
  "scope": "Four invented document periods; no actual bank cadence, retention, account, PDF or application test.",
  "expected_periods": [
    "P1",
    "P2",
    "P3",
    "P4"
  ],
  "method": "Count unique period aliases and compare sets; filename count alone does not establish coverage.",
  "results": [
    {
      "case": "complete",
      "files": [
        "P1",
        "P2",
        "P3",
        "P4"
      ],
      "file_count": 4,
      "unique_period_count": 4,
      "missing_periods": [],
      "duplicate_file_count": 0,
      "synthetic_only": true
    },
    {
      "case": "missing_P3",
      "files": [
        "P1",
        "P2",
        "P4"
      ],
      "file_count": 3,
      "unique_period_count": 3,
      "missing_periods": [
        "P3"
      ],
      "duplicate_file_count": 0,
      "synthetic_only": true
    },
    {
      "case": "duplicate_P2",
      "files": [
        "P1",
        "P2",
        "P2",
        "P3",
        "P4"
      ],
      "file_count": 5,
      "unique_period_count": 4,
      "missing_periods": [],
      "duplicate_file_count": 1,
      "synthetic_only": true
    }
  ]
}