(b,1), (d,1), (h,1), (b,3), (f,3), (h,3), (i,4), (d,4), (b,5), (f,5), (h,6), (d,6), (e,7), (b,7), (f,8), (h,8), (2,a), (e,2), (e,9), (f,1), (a,9), (i,7), (a,4), (i,9).

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