# C1542 — Explain thelower merge mechanism

## Question

Why does the1550 merge preserve these three reversed totals?

## Sources

```json
[]
```

## Opened utc

2026-09-29T02:36:15.973477+00:00

## Results

```json
{
  "significant_core_additions": [
    [
      343,
      155,
      498
    ],
    [
      434,
      155,
      589
    ],
    [
      331,
      155,
      486
    ]
  ],
  "each_place_adds_without_carry": true,
  "register": "three-digitcore,onetrailingzero throughout"
}
```

## Finding

Everyplace adds withoutcarry andthethree-digit/one-zero register stays fixed. Reversal distributes over these particular sums.

## Reassessment

Now split the shared1550 block itself into theoriginal600 and950 lives.

## Checks

```json
{}
```

## Closed utc

2026-09-29T02:36:15.974103+00:00

## Record provenance

Exact record hash: `9b6286fdba745398afab41d2a6ecc0c8ec3b0cfe5b3ea0dd771626cb5a55b77e`

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