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

110i

121

I'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 loop.

playingfalseplayingfalseX's turn?available squaresavailable squaresnumberlength1

X

helper for 5.6.3.7

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