# C1223 — Bind the source nodes of the SP equal-gain rectangle

## Question

Which node classes and placements must remain distinct before the row mechanisms are substituted?

## Inputs

```json
{}
```

## Sources

```json
[
  "Strategy §4.3",
  "File18 §§3.1,6C.1",
  "File22",
  "prep/family_synthesis_candidates.json"
]
```

## Opened utc

2026-09-28T05:32:29.012764+00:00

## Results

```json
{
  "source_nodes": {
    "path": "model/SP_rectangle_source_nodes.json",
    "sha256": "73d96eaab3a4be396ee556bf510367945b9a26048dc881a7653e8d321fd91c23",
    "bytes": 1113
  }
}
```

## Finding

The rectangle uses the Regular week opening4206 and Cumulative decade opening13406. Their underlying4199 and13396 endpoints have different wrappers; these supplied source roles must remain visible.

## Reassessment

Generate the Regular head from the located source begetting changes and declared frame shift.

## Checks

```json
{
  "five_bindings": true,
  "wrappers": true
}
```

## Closed utc

2026-09-28T05:33:40.687282+00:00

## Record provenance

Exact record hash: `4ec3f8cfe1272f897337b2abe6c3f0965d00d945de509426dfc0daa2db1ecc68`

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