Let*D
*be the set of all calendar dates from 4/30/1789 to 9/25/2014.
Let*P
*be the set of names of U.S. presidents.
Let*F
*be the set of names of first ladies of the U.S.
Consider the following two functions*pres:D \rightarrow P
*where*pres(d)
*is the name of the president of the U.S. on date*d...
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