# C1609 — Recover the new refinement from source words

## Question

Do the5600 and2100 internal edges depend on choosing536 after the fact?

## Sources

```json
[
  "lower_spine_map.json",
  "Comparative_Study §§3.1,4.2,7.2"
]
```

## Opened utc

2026-09-29T14:57:56.609571+00:00

## Results

```json
{
  "LXX_Regular_inverse_sum": 9030,
  "MT_Cumulative_inverse_lower": 3430,
  "SP_Cumulative_inverse_lower": 1330,
  "first_edge": 5600,
  "middle_edge": 2100,
  "last_edge": 4900,
  "shared_completed_base": 4106
}
```

## Finding

They do not:5600=9030−3430 and2100=3430−1330, with the common4106 base canceling. Only the final4900 placement uses the appointed restoration target.

## Reassessment

The source-derived path is ready for the already-authorized forward2700 transport; keep the operation distinct from a new mirror investigation.

## Checks

```json
{}
```

## Closed utc

2026-09-29T14:57:56.610413+00:00

## Record provenance

Exact record hash: `fa19d60a6e13cc947bad0a9aa63e5e1670ba9aba0310035d8f38a7facaac9c8c`

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