The cartesian product of two sets is the set of all possible pairs of elements, where the first element of each pair is taken from the first set, and the second element is taken from the second set.  For example, the cartesian product of {low, medium, high} with {true, false} is {(low, true), (low, false), (medium, true), (medium, false), (high, true), (high, false)}.  More Info

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