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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...