# C1551 — Classify theSP partition family

## Question

Which of the sevenSP constructions share a head, and why?

## Sources

```json
[]
```

## Opened utc

2026-09-29T02:37:40.602160+00:00

## Results

```json
{
  "classes": {
    "11416": [
      "F",
      "S",
      "N",
      "FS",
      "FN"
    ],
    "7096": [
      "SN",
      "FSN"
    ]
  },
  "upper1550_gain": 0,
  "600_refinement": "inheritedzero localdefects",
  "explicit_life_loss": 4320
}
```

## Finding

F/S/N/FS/FN form oneSP head class, whileSN/FSN form a second4320 later. The same local laws explain both classes.

## Reassessment

Determine exactly how the earlier SP upper-branch translation changes through Noah.

## Checks

```json
{}
```

## Closed utc

2026-09-29T02:37:40.602993+00:00

## Record provenance

Exact record hash: `1269a5b20c6a8a763f76ae43b75a795f3405b00712857b348f4c8c4f53ffe037`

Source journal: `Research_Cycles/C1483_C1582/c1483_c1582/journal.json`