# Q23 · Supersession chain

Memorandum

One became two before T-208. Three became four before R-441. Two ladders share a wall; their rungs must not be exchanged.

```json
{
  "carbon_chain": [
    1,
    2
  ],
  "freight_chain": [
    3,
    4
  ]
}
```

## Related records

- [Q44 · Accepted instrument revision receipt](/archive/quiet-index/r5/q44)
- [Q08 · Superseded seal register](/archive/quiet-index/r5/q08)
- [Q24 · Memo filed in the wrong sleeve](/archive/quiet-index/r5/q24)

Canonical: /archive/quiet-index/r5/q23
Revision: quiet-index-r5. The margins keep count.