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Parity is a term used in coloring. It represents the state of a candidate in a cluster.

Within a color cluster, there can only be 2 parities. Each candidate within the cluster is assigned to one of these parities. The 2 parities are each other's opposite.

For each pair of candidates within the cluster, there are two possible situations:

  • Parities are the same
These candidates are equivalent. They must be true or false together.
  • Parities are opposite
Only one of these candidates will be true. The other must be false.