ABCDEFGHIJKLMNOPQRSTUVWXYZ
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Grid coordinates are top-down, left-right
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1,11,21,31,41,51,61,71,81,9
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2,12,22,32,42,52,62,72,82,9
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3,13,23,33,43,53,63,73,83,9
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4,14,24,34,44,54,64,74,84,9
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5,15,25,35,45,55,65,75,85,9
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6,16,26,36,46,56,66,76,86,9
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7,17,27,37,47,57,67,77,87,9
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8,18,28,38,48,58,68,78,88,9
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9,19,29,39,49,59,69,79,89,9
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Nonet coordinates
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1,12,13,1
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1,22,23,2
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1,32,33,3
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