@hyper-neutrino MTZz always error on integers. X errors on strings/negatives. Quicks always error if they don't have enough preceding links. Ɠ errors if eval fails on the STDIN line. Ɠɠ both error if there's no more STDIN, ¡ and # both error if there is no more STDIN assuming they only have 1 link. G fails if the argument has both a list and an integer at the same depth (e.g. [1, [1]]). y fails if passed a list with an odd-length. b fails if the right argument is complex