Plus as a bonus you can code golf and try for the shortest solution. I haven't code golfed anything in arc, but I bet it'll do well.
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I also think it's part of PG's design goals to have a concise powerful language. (http://www.paulgraham.com/arcchallenge.html)
Even though code golf is program length instead of counting codetree nodes, it's a similar idea and provides interesting small problems to learn on.