puzzle 20: "pow pow"

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since it's almost thanksgiving, thanks to all of you who solve these puzzles and offer feedback and support and all that jazz. really appreciated.

as for thanksgiving--might have a semi-holiday themed puzzle ready by then, although it's not cooperated so far, and i don't know how much time i'll have to try to make it work between now and then. so, uh, this is just to say that you shouldn't be surprised when a thanksgiving themed puzzle drops in middle march or something.