# C328 — Four admitted MT contexts: source review

**The Noah 950 residual 490 occurs only at MT restored Cainan ON/Terah60 within the held four-context menu.** This conditional result does not prescribe a preferred context or establish source necessity.

The review checks all 60 admitted MT records, the fifteen fixed SP endpoints, and all 300 annual comparisons: 559 checks pass. Mixed-phase enumeration belongs to the separate main audit.

## Context dependence

SP remains primary OFF/Terah0/full430. MT remains full430 with the same Gear and first-role identity; only its two admitted switches change.

| MT Cainan | MT Terah60 | Context difference δ | Noah 950 residual | Positive annual pairs | Distinct positive residual values |
|---|---:|---:|---:|---:|---|
| OFF | 0 | 650 | 300 | 6 | 300,450 |
| OFF | 1 | 590 | 360 | 12 | 10,360,510 |
| ON | 0 | 520 | 430 | 12 | 80,430,580 |
| ON | 1 | 460 | 490 | 18 | 40,140,490,640 |

There are 75 ordered pairs per context and 48 positive pairs overall. Every selected B is an existing record, not a fitted endpoint.

With binary switches c and t, the verified local relation is

`δ = 650 − 130c − 60t`, and `r = d − δ`.

The 500-source intervals also acquire positive 40 remainders only at ON/Terah60 in this menu. Their underlying SP biographies remain fixed and valid throughout.

## Source controls

File18 lines255–264 distinguish the regular +60 Terah fork, regular Cainan +130 insertion, cumulative Cainan +460 insertion, and SP-local person companion. Lines1118–1146 explain the method-specific Cainan values and their scopes. **No cumulative 460 insertion is used here.** The 460 in the final row is a composite regular context difference, 650−130−60.

File18 line319 retains the regular variants as simultaneous states, not corrections of one another. All four filtered MT contexts preserve Noah 950, Shem 600, and same-Gear Noah-bound 500.

SP primary Noah death retains File18 line1581's inclusive/harmonic qualification. Line1460 rejects adding an inclusive year to every lifespan, so the matched 950 subtraction remains valid.

The textual 502 binding remains distinct, as File18 lines755–771 and 1254–1282 require. Neither a two-year binding change nor an SP companion is part of these context switches.

## Claim boundary

The exact 490 is one conditional residual among admitted choices. This establishes context dependence, not historical priority, an annual/context selector, an E prescription, or independent witnesses.

Inherited phase, ancestry, and event qualifications remain intact. No endpoint, phase, anchor, or operator was added. **C329 was not executed.**