Problem 5 Find the domain and range of the following functions. 1. The function that assigns to each pair of positive integers the first integer of the pair. 2. The function that assigns to each positive integer the largest perfect square not exceding this integer. 3. The function that assigns to a bit string the number of ones minus of zeros the number string. 4. The function that assigns to each pair of positive integers the the minimum of these in the two integers.

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