Maybe my English is not good enough, but when I read that the original poster wants to be sure that ALL variables are unique, I come to the conclusion that none of them may be equal to any other one. Ricky's solution won't work for that, it only checks whether ALL variables are equal to each other (true), or at LEAST one of them is not (false). By the way, when I try Ricky's solution, I get incorrect format message. And sorry for my typing mistake *bow*
