Keys: → step, ← back, space play, End run to end, Home reset. Click a region to outline its neighbors.
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Inference
0assignments
0backtracks
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Variables and domains
R availableR blocked by an assigned neighborR removed by inference
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County boundaries: U.S. Census Bureau cartographic files via us-atlas. State boundaries: Natural Earth. Adjacency is computed from shared borders; the Australian Capital Territory is folded into New South Wales, as in AIMA.