Setting,Active use
Normal MT regular,430 years in Egypt; no optional +60 Terah or restored second Cainan; normal Exodus 1446 and Conquest 1406
Optional +60 Terah,Opened only for the 2296 → 2166 → 2006 → 1876 symmetry; downstream Abraham/Jacob/Egypt dates remain fixed
Selected LXX regular comparison,Localized −33 corridor beginning at Terah and continuing through the Jacob/Levi material; not a global LXX Creation/Flood adjustment
SP regular comparison,Selected family coordinates 215 years later than normal MT; alternative 215-year Egypt construction; fixed Exodus and Conquest
MT cumulative,Recorded lifespans stacked end to end; ordinary biography dates and cumulative positions remain separate
Counting,"Ordinary subtraction for the all-BC examples; no Mirror, digit reversal, or Rounded operation"