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Classical problem: There are a pair of rabbits, from the birth of the first 3 months of each month from birth to a pair of rabbits, a small rabbit to the first three months after a long month, again with a pair of rabbits, if not dead rabbit and asked each The total number of months the number of rabbits? 1. Program analysis: a rabbit out of the law of 1,1,2,3,5,8,13,21 ....