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    The "Between Two Sets" problem on HackerRank is about finding how many integers satisfy two conditions at the same time. First, all the numbers in the first set must divide the integer evenly, and second, the integer must evenly divide all the numbers in the second set. For example, if a = [2, 4] and b = [16, 32, 96], the numbers that meet both conditions are 4, 8, and 16, since both 2 and 4 divide them perfectly, and they also divide 16, 32, and 96 without any remainder. Therefore, the final answer would be 3.