{
  "domain": "All source Noah birth families distinguished by tradition, rail, Cainan, Terah60 and full430; Gear transitions1->2 and2->3; all target Noah/Shem families at the same Gear transition; source-family next-Gear Flood start or close as J pivot; target-family next-Gear Shem death as other J pivot. E pivots are target Noah births at each slice.",
  "filters_excluded": [
    "529 divisibility",
    "previous P/J common-hit membership",
    "17K membership",
    "desired numerical outputs"
  ],
  "fixed_ratios": {
    "E": "25/23",
    "J": "300/299"
  },
  "scope_limit": "Same-Gear coherent family motif only; not arbitrary endpoints or arbitrary pivot-role assignments."
}