Hello, world 12 0 dlrow ,olleH el ld 'e' abc a Just ('a', "bc") Nothing pack ['u', 'n', 'p', 'a', 'c', 'k'] [] concatenate [False, True, False, False, False, False, False] [True, False, False, False, False, False, False] [False, False, False, True, False, False, False] [False, False, False, False, True, True, False] [False, False, False, False, False, True, False] [False, False, False, False, False, True, True] ['a', 'A', '~', '0', ' ', '\n', '\159'] [97, 65, 126, 48, 32, 10, 159] ['i', 't', 'e', 'r', 'a', 't', 'o', 'r', ' ', 'u', 'n', 'p', 'a', 'c', 'k'] "terator tail" True False True False