# C281 author review

Question: Which transported Noah counterparts exist without the SP companion rail?

Conclusion: The restored MT realization supports three600 rectangles and two598/two602 crosspairs; SP-only companions cannot be transferred.

The exact results were inspected against the source register and independently expressed domain identities in the checker. The second run verifies deterministic reproduction, not independent scientific review. No new agent review is claimed.

Limits:

- No MT companion rail is admitted.
- Missing source records cannot be supplied by covariance alone.
- Regular Cainan remains130, cumulative Cainan460.

The report and checkpoint are authored interpretations. The verifier authenticates the supplied inputs and calculations; it does not prove historical intentionality. Original dependencies and all standing controls remain unchanged.