 If every pair in a set of integers is coprime, then the set is said to be "pairwise coprime" (or "pairwise relatively prime", "mutually coprime" or "mutually relatively prime").Pairwise coprimality is a stronger condition than setwise coprimality; every pairwise coprime finite set is also setwise coprime, but the reverse is not true.For example, the integers 4, 5, 6 are (setwise) coprime (because the only positive integer dividing "all" of them is 1), but they are not "pairwise" coprime (because gcd(4, 6) = 2).