{
  "retained": [
    "source row totals R2700 and C12600",
    "two three-digit cores, each with one trailing zero",
    "source cumulative carry branch (H,T,U)=(12,5,10)",
    "Actual selection shifts regular +8 and cumulative \u22122",
    "Conquest anchor1406; named source partitions for historical interpretation"
  ],
  "derived": [
    "regular inverse10620",
    "cumulative inverse10620 conditional on branch",
    "matching weight4:1",
    "absolute12026",
    "continued14726 from +2700"
  ],
  "not_recovered": [
    "individual digit allocation",
    "ordered breakpoint",
    "historical causation"
  ],
  "terminology_correction": "C932 lists four input categories, not a proved four-premise independent basis"
}