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Opposite
Candidates are opposite when only one of them must be true, while the other must be false. They have opposite parity within a cluster.
In coloring, colors represent parity. Since there can only be two colors in a single cluster, one of them must belong to the solution, while the other does not. All candidates with the same parity are equivalent.
This page was last modified 13:52, 3 November 2006.
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