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rose-ash/plans
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mk: not-membero — relational "x is not in l"
Mirrors the structure all-distincto already uses internally: walk the
list, ensure each element is not equal to x via nafc, recurse on tail.
Useful as a constraint-style filter:

  (membero x (list 1 2 3 4 5))
  (not-membero x (list 2 4))
    -> x in {1, 3, 5}

4 new tests, 382/382 cumulative.
2026-05-08 11:36:14 +00:00
..