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- Enter a series of single digit numbers that add up to the numbers found in the adjacent blocks. (ex. adjacent block reads "12," numbers used in a triple block solution could be 1+6+5, 2+4+6, 8+1+3, ...)
- Use only numbers 1-9.
- Numbers can only be used once in each row or column.
- Numbers can be listed in any order as long as the cross-numbers add up to the target sum.
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