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mk: phase 6F — fd-distinct (pairwise alldifferent)
(fd-distinct (list a b c ...)) imposes pairwise distinctness via O(n²)
fd-neq constraints. Each fd-neq propagates independently when any pair
becomes ground or has a domain-removable value.

Tests: empty/singleton trivially succeed; pair-distinct/equal cover
correctness; 3-perms-of-3 = 6 and 4-perms-of-4 = 24 confirm full
permutation enumeration; pigeonhole 4-of-3 fails.

7 new tests, 610/610 cumulative.
2026-05-08 14:35:19 +00:00
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