# C899 — Recover the two complete civil comparison squares

## Question

Do the paired30 shifts preserve each entire source-appointed arm?

## Inputs

```json
{}
```

## Sources

```json
[
  "File63 §7.9"
]
```

## Opened utc

2026-09-28T02:53:18.757043+00:00

## Results

```json
{
  "squares": [
    {
      "civil_nodes": [
        -145600,
        -2080,
        0
      ],
      "body": 143520,
      "terminal": 2080,
      "total": 145600,
      "source_total": 145600
    },
    {
      "civil_nodes": [
        -145570,
        -2050,
        30
      ],
      "body": 143520,
      "terminal": 2080,
      "total": 145600,
      "source_total": 145600
    }
  ],
  "artifact": {
    "path": "model/paired_civil_squares.json",
    "sha256": "f93729bd50b8e39a077d0776e95f581e7288413a6c66c4468be2912ad4f82e8b",
    "bytes": 330
  }
}
```

## Finding

Both complete arms decompose145600 as143520+2080. Their corresponding civil nodes all shift by30, including1BC→AD30. The equality uses civil crossing and preserves the source-appointed comparison roles.

## Reassessment

Integrate the carrier lift and retained-subdivision result into the common grammar.

## Checks

```json
{
  "whole_arms": true,
  "translation": true
}
```

## Closed utc

2026-09-28T02:53:18.758352+00:00

## Record provenance

Exact record hash: `82ef13c003106d94a0ac3e160b171e20cfa6e17ee4fb630d742904f83c7ad7c5`

Source journal: `Research_Cycles/C0832_C0931/journal.json`