Antiparallel 12-hour Clock Hands Print each of the 11 times, one per line, in the I:M:S format, at which the hour and minute hands of a 12-hour clock are antiparallel. Here I is the two digit hour, with 12 in place of 0; M is the two digit minute, and S is the truncated seconds value. The output ...

Find duplicates in a given string code-golfstring Challenge Given a string of any length, determine if there are any duplicate characters in the string. Rules Standard I/O methods are permitted. Standard loopholes are forbidden. This is code-golf, so shortest solution in bytes wins! Examples "abcdef