jeff: Ooooooh, this was scary.
Somehow I muddled my way through it. (3 years ago)
Ducks: Not sure if squared root of -1 should be included, since it only isn't feasible on the real number line, if we look at imaginary numbers (which despite the name are feasible) the solution is trivial. (3 years ago)
toast: The something over three line is cheeky but the currently impossible line is a nice touch. (3 years ago)