giles 363ebc8f04 mk: appendo3 — 3-list append ...

Composes two appendos: (appendo a b mid) ∧ (appendo mid c r). Runs
forward (concatenate three known lists) and backward (recover any of
the three from the other two and the result).

5 new tests, 491/491 cumulative.

2026-05-08 12:16:40 +00:00

755 B

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