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Feb 21st, 2018
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  1. (1) Each element of X must be paired with at least one element of Y,
  2. (2) No element of X may be paired with more than one element of Y,
  3. (3) Each element of Y must be paired with at least one element of X, and
  4. (4) No element of Y may be paired with more than one element of X.
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