# Reading guide — chronological families through C1131

Start with **490d_How_Chronological_Families_Fit_Together_C1131.md**. Its family table and opening SP chapters state the main mechanism; its final synthesis states what that mechanism explains and what remains supplied.

Three advances organize the draft:

1. **A local source mechanism connects Regular and Cumulative.** The SP birth chain gives Flood capacities. Capping the baseline lives generates the three shortened lives and their 488-year reduction, whose ordered accumulation generates the Cumulative displacement.
2. **The inverse junction has a bounded explanation.** The admitted digit register and carry branch explain 10620 and the common 12026 placement. Continuing to 14726 uses the declared original 1400 tail. Key completion connects the complete paths, while preserving their different internal boundaries.
3. **Repeated agreements have a dependency structure.** Some Key and Covenant equations repeat conditions already retained. Other source choices remain necessary. Counted lists and literary groupings extend the same reconstruction question to order, multiplicity and symmetry.

For orientation, open **490d_Chronological_Family_Map_C1131_Final.png**. For derivations, use **490d_Chronological_Families_Technical_Companion_C1131_Final.md**. The three JSON registers give inputs, operations and constraints in reusable form. **Source_Claim_Index_C1131.md** and the main draft's section notes locate the evidence.

The evidence ZIP includes the complete C932–C1131 journal, executable calculations, frozen source copies, all corrections and independent reviews. These are 200 sequential research and synthesis actions, not 200 independent discoveries. The packet’s final verification report supplies the exact replay result.

Latest File52c remains the Rounded controller. A second decimal inversion remains deferred. The strongest next question concerns the source choices left undetermined by the present reconstruction; see **Next_Research_Question_C1131.md**.