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Multiplicacions per dos xifres, entre 2 i 9
2 5 1 5 1 0x 4 5 x 5 3
7 8 1 7 7 1x 5 6 x 4 3
1 5 0 9 6 4x 6 2 x 7 9
5 9 7 7 8 1x 4 8 x 7 5
2 4 4 6 0 3x 9 5 x 6 6