# C1254 — Reconstruct the whole regular displacement staircase

## Question

Do thecentury support masks explain every boundary behind1250 and650?

## Inputs

```json
{}
```

## Sources

```json
[
  "C1182",
  "C1253"
]
```

## Opened utc

2026-09-28T05:45:28.122335+00:00

## Results

```json
{
  "staircase": {
    "path": "model/regular_kernel_complete_staircase.json",
    "sha256": "dbf847b6bd763d2c10d8dbc1144a44d7e89fc83c8597def0302bc4bacf8f66d1",
    "bytes": 863
  },
  "field": [
    1250,
    1150,
    1050,
    950,
    850,
    750,
    750,
    650,
    650,
    650,
    650,
    650,
    550,
    450,
    350,
    250,
    150,
    50,
    0,
    0
  ]
}
```

## Finding

The named row masks generate the whole20-boundary1250-to650-to0 staircase. The600 drop beforeNoah is the sum of six located century changes; the650 plateau is the shared post-Flood contribution.

## Reassessment

Restore nativeCainan and check that its support is a partialfieldchange.

## Checks

```json
{
  "field_expected": true,
  "recurrence": true
}
```

## Closed utc

2026-09-28T05:45:28.122809+00:00

## Record provenance

Exact record hash: `51f2670a249422df989754b6c32ec0df916ab7d23a61ef2136789912d27daf54`

Source journal: `Research_Cycles/C1132_C1431_Recovered/journal.json`