7 5 5 3 6 2
8 1 7 6 5 1
5 8 4 3 4 5
4 6 8 1 2 9
1 2 8 4 7 8
6 5 3 7 4 5
Erase 2 numbers from each row (total of 12 numbers erased),
such that each row and each column has 4 numbers left,
and each row and each column adds to 20.
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