# C1545 — Derive the upper1550 partition response

## Question

How much does separating1550 from the remaining upperprefix change each primary trunk?

## Sources

```json
[]
```

## Opened utc

2026-09-29T02:37:40.574039+00:00

## Results

```json
{
  "MT": {
    "prefix": 7620,
    "primary_upper": 7190,
    "Noah_grouped_upper": 8180,
    "gain": 990
  },
  "LXX": {
    "prefix": 7600,
    "primary_upper": 5190,
    "Noah_grouped_upper": 12210,
    "gain": 7020
  },
  "SP": {
    "prefix": 7130,
    "primary_upper": 8680,
    "Noah_grouped_upper": 8680,
    "gain": 0
  }
}
```

## Finding

The upper gains are990 forMT,7020 forLXX and0 forSP. The lower merge contributes zero in each case.

## Reassessment

Combine the upper gain and shared split loss into one full-refinement law.

## Checks

```json
{}
```

## Closed utc

2026-09-29T02:37:40.575002+00:00

## Record provenance

Exact record hash: `06bcd70e07de700498471a82e802872fc95602ba88d37e1585cdaa9ec45c5ed3`

Source journal: `Research_Cycles/C1483_C1582/c1483_c1582/journal.json`