> for m in test: > for n in test: > for o in test: > for p in test: > print m+n+o+p Thanx for your anwser. But if I consider about a combination of over 26 letter's list just like: "abcdefssdzxcvzxcvzcv" "asllxcvxcbbedfgdfgdg" ..... Need I write 26 for loops to do this? Thanx Jia LU