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See 3.3.3.3 above for why we have to test PLAYING.available squares3.3.3 TIF A, here on down. See comment below.available squares1I'm kind of bummed that I didn't find a beautiful one-line solution using FIND FIRST, but it just gives the value it finds, not the position in the list, which is what we need to find the line endpoints in WIN LINES. So it's a plain old fashioned FOR 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