Puzzle

| Seeing as its thst time of year again and everyone is posting their | homework, has anyone got any good puzzles to do? | I wouldn't mind having a go at something a bit tricky. Here is another one: figure out what `unknown' is.

unknown = mysterious unknown

mysterious ks = 0 : weird ks weird (k : ks) = (k + 1) : mysterious ks

Cheers, Ralf