# Chronological families: checkpoint C811

Eighty steps are complete. BJ now extends the same source-path grammar already used for MT/LXX/SP and Rounded.

The22-head index and its23-head retained-Kainan comparison are ordered labelled objects. Deleting one position has weight1 in the index, while the supplied BJ chronology deletes57 years; the controlled regular/cumulative Cainan weights remain130/460. No BJ cumulative lifespan is inferred.

The full secondary deletion ledger is3856→2549→2482→2425 becoming3799→2492→2425. It retains the inherited1307 interval. The apparent2450→2400 reduction is57−7 because the compared starting roles change. The four-node reflection belongs to the separate mixed comparison using original nodes, not to the entire expunged chronology.

The complete biological and surface Abraham→Conquest paths are100|60|130|285 and111|59|125|280. Both retain575; their internal changes11|−1|−5|−5 sum to zero. Six literal jubilee timestamps regenerate under the49-year encoding. The source’s59-versus70 and142-versus147 tensions remain visible.

Two290-year partitions,100|60|130 and115|60|115, coarsen the same six-node path. The larger460|1490|460|40 path transfers the existing retained-component Key rule: expanding the final460 to500 reaches Conquest while holding the earlier path fixed.

The source NT heads5326 and2876 share the2450 duration through35×70=50×49, with their own event roles retained.

Next: integrate these findings with File52c and the prior calendar/shape families, independently review the full account, and finish the100-step record.