# C791 — Sixty-step synthesis checkpoint

## Question

What do finite variants add to the common explanation?

## Inputs

```json
{}
```

## Sources

```json
[
  "C772–790"
]
```

## Opened utc

2026-09-28T02:04:36.995646+00:00

## Results

```json
{
  "checkpoint": {
    "path": "deliverables/490d_Chronological_Families_Checkpoint_C791.md",
    "sha256": "1791215de10167594a972b3e5d146f2b4b7909bb9ffc7aff04efa75719c935df",
    "bytes": 1562
  }
}
```

## Finding

Finite variants fit as bounded choices acting on source-defined supports. Cross-mode behavior depends on the source row lift, not just the variant name.

## Reassessment

Reconstruct the complete BJ index object.

## Checks

```json
{
  "sixty": true
}
```

## Closed utc

2026-09-28T02:04:36.995948+00:00

## Record provenance

Exact record hash: `9da786515e20778d2df0bb0da042d156520d8f8fc914ceace679348f9d27309e`

Source journal: `Research_Cycles/C0732_C0831/journal.json`