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== Common
A '''common transversal''' of the collections ''A'' and ''B'' (where <math>|A| = |B| = n</math>) is a set that is a transversal of both ''A'' and ''B''. The collections ''A'' and ''B'' have a common transversal if and only if, for all <math>I, J \subset \{1,...,n\}</math>,
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