Actually, there's also an empty line when you do this. Because of that, a better way to say this is that the output is the set of all subsets of the input list where the elements in the subset follow the order from the original list. This includes the trivial solutions of the empty set and the original set, in addition to all other non-trivial solutions. So that's some nice golfin' there :-)

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain