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If you have two sets, S and T, where the cardinality of S is x (ie S has x distinct elements) and the cardinality of T is y, then the number of combinations from S and T is 2(x+y).

There will be

1 null combination,

2x - 1 combinations of elements of S,

2y - 1 combinations of elements of T,

and the rest will contain at least one element from each of the two sets.

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