This is an arrangement of nine counters on the irregular board of 67 squares.
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No two counters are in the same row, column, or diagonal.
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No. XC
This is the arrangement of nine cards in ten rows, three in each row—
| K ♢ | Q ♠ | K ♡ | ||||||
| A ♣ | A ♢ | A ♠ | ||||||
| 10 ♡ | K ♣ | J ♢ | ||||||
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