Ordered pair of subsets

If AA and BB are subsets of U={1,2,3,4,5}U=\{1,2,3,4,5\} such that AB=U,AB=,A \cup B = U, A\cap B =\emptyset, how many possible choices are there for the ordered pair (A,B)(A,B)?

Details and assumptions

It is possible that A=A = \emptyset or B=B = \emptyset.

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