C242 — The second 11-fold expansion reaches the preceding MT Flood Gear

23 September 2026 · Step 37 of 60, continuing C205.

The second expansion supplies a retained endpoint: 11×625=6875=13×529−2. At the two complete Creation origins, it reaches the MT Flood start one regular Gear before the original 6877 endpoint.

This adds endpoint support to the formerly formal 6875 entries in the C09 construction. It does not make the three-stage 11-fold chain wholly sourced: its first expanded endpoint is still generated. The two-year relation uses only permitted Flood Gears.

Evidence and scope

K=529 and r=25/23. BC base B means (B+1)t/Bn BC; reflected AD base A means AD At/(A+1)n. Their civil span is B+A in both seasonal components, with no year zero. Signed paired centers are −B and +A; the center model uses components ±1/4 and restores this separation after dilation. An interval center is geometry, not an event or a proposed universal Mirror axis.

Regular Gears are restricted to Noah/Shem/Flood. Creation and Conquest retain fixed source-field members; no fourth Gear is admitted. Generated coordinates, source-field membership and stored graph incidence are distinct. File_18/File_09 and the frozen C127 graph are unchanged. Earlier N01/N03 qualifications, the missing Shem join, closed primers and unestablished original Reports 11–25 remain unchanged. This packet selectively uses prior evidence; it does not rerun completed campaigns. Assertions and alternative placements are not independent historical witness counts.

7 step-specific checks and 19 frozen-input checks passed. Exact inputs, results and predecessor hashes are in the accompanying JSON records; calculation code is in the evidence archive. Source dependencies are identified in the body and frozen in sources/.