giles
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Defines latin-2x2 over 4 cells and 4 all-distincto constraints. Enumerates exactly 2 squares ((1 2)(2 1)) and ((2 1)(1 2)); a corner clue narrows to one. 3 new tests, 269/269 cumulative. 3x3 (12 squares, the natural showcase) is too slow under naive enumerate- then-filter — that is the motivating test for Phase 6 arc-consistency.