# C497 — One shared tail links12026 and14726

## Question

How does the documented1400 leg connect the two backbone anchors?

## Inputs

```json
{
  "Conquest": 1406,
  "Nativity": 6,
  "primary_reversed_sum": 10620
}
```

## Sources

```json
[
  "File52c §§3.3–3.4"
]
```

## Opened utc

2026-09-27T22:42:47.572297+00:00

## Results

```json
{
  "tail": 1400,
  "reversed_tail": 4100,
  "net_anchor_change": 2700,
  "Conquest_backbone": 12026,
  "Nativity_backbone": 14726,
  "Nativity_span": 14720,
  "E_span": 16000
}
```

## Finding

Appending the shared1400 leg changes the reconstructed endpoint by4100−1400=2700. Both primary paths therefore continue together from12026 to14726. The backbone’s14720 span then expands to16000.

## Reassessment

Identify the decimal gain law that explains the990 and2700 increments.

## Checks

```json
{
  "continuation": true,
  "expansion": true
}
```

## Closed utc

2026-09-27T22:42:47.572502+00:00

## Record provenance

Exact record hash: `a7622ff34f06565ea4ce69b1787c1e6ffff17cb40d448a0b624d37c4e3f21ac9`

Source journal: `Research_Cycles/C0482_C0531/journal.json`