# C537 — Distinguish bilateral expansion from a mixed comparison

## Question

How do the350 and336 displays arise from the same161 spine?

## Inputs

```json
{
  "original_triple": [
    1728,
    1567,
    1406
  ],
  "held_midpoint": 1567
}
```

## Sources

```json
[
  "File60 §§3.3–3.4"
]
```

## Opened utc

2026-09-28T00:00:33.967755+00:00

## Results

```json
{
  "uniformly_expanded_triple_diagnostic": [
    1742,
    1567,
    1392
  ],
  "uniform_outer_width": 350,
  "one_arm_expanded_with_original_terminal": 336,
  "historical_outer_width": 322
}
```

## Finding

Both arms expanded give175+175=350. Expanding only the Ishmael arm while retaining the original terminal gives175+161=336. The generated1392 companion is only the algebraic fixed-midpoint display, not a newly admitted historical node.

## Reassessment

Resolve the147/161/175 progression and its14-unit connection to later clutch operations.

## Checks

```json
{
  "uniform": true,
  "mixed": true,
  "historical": true
}
```

## Closed utc

2026-09-28T00:00:33.967938+00:00

## Record provenance

Exact record hash: `ff2888920b75c1992ac755e7c1af426afe2a0ae939a4b4c066f5de280d78b711`

Source journal: `Research_Cycles/C0532_C0631/journal.json`