# C1590 — Carry source differences into the inverse lower legs

## Question

Which of the source-generated910 and120 differences survive reversal of the complete Flood–Conquest leg?

## Sources

```json
[
  "postflood_rounded_rows.json",
  "Comparative_Study §§2.2,4.1,7.2"
]
```

## Opened utc

2026-09-29T14:54:39.428366+00:00

## Results

```json
{
  "original": {
    "MT": 3430,
    "LXX": 4340,
    "SP": 3310
  },
  "reversed": {
    "MT": 3430,
    "LXX": 4340,
    "SP": 1330
  },
  "source_gaps_LXX_MT_SP": [
    910,
    120
  ],
  "inverse_gaps": [
    910,
    2100
  ]
}
```

## Finding

The MT and LXX legs are individually self-reversing, retaining910. SP3310 becomes1330, so its120 source gap below MT becomes2100 in the inverse construction.

## Reassessment

Explain the SP amplification from decimal place values, then identify the source condition behind its MT Shem coincidence.

## Checks

```json
{}
```

## Closed utc

2026-09-29T14:54:39.429380+00:00

## Record provenance

Exact record hash: `3144c5ec3d4d8879795afbd5613a9a2515493604bb7719e034ad0c19c4586d83`

Source journal: `Research_Cycles/C1585_C1634/journal.json`