Two integers are relatively prime (or coprime) if there is no integer greater than one that divides them both (that is, their greatest common divisor is one). For example, 12 and 13 are relatively prime, but 12 and 14 are not, because they are both divisible by 2. As preconditions, you may assume that 'a' and 'b' are both positive integers greater than 1. You may NOT assume that a<b or that b<a.