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October 15, 2015 00:27
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| allDifferent :: Ord d => [ID] -> Constraints d | |
| allDifferent ids = do | |
| domains <- forM ids (use . domainAt) | |
| let unified = mconcat domains | |
| newDomains = map (\d -> d \\ (unified \\ d)) domains | |
| zipWithM_ updateVariable ids newDomains |
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