CheckerBoard.txt
81 32
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4 10 11 2 1
4 12 13 4 3
4 14 15 6 5
4 16 17 8 7
4 20 21 12 11
4 22 23 14 13
4 24 25 16 15
4 26 27 18 17
4 28 29 20 19
4 30 31 22 21
4 32 33 24 23
4 34 35 26 25
4 38 39 30 29
4 40 41 32 31
4 42 43 34 33
4 44 45 36 35
4 46 47 38 37
4 48 49 40 39
4 50 51 42 41
4 52 53 44 43
4 56 57 48 47
4 58 59 50 49
4 60 61 52 51
4 62 63 54 53
4 64 65 56 55
4 66 67 58 57
4 68 69 60 59
4 70 71 62 61
4 74 75 66 65
4 76 77 68 67
4 78 79 70 69
4 80 81 72 71