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2x 1 3 6x 2 5 1 3 verify
2x 1 3 6x 2 5 1 3 verify pictures 5
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2x 1
2x 1 3 6x 2 5 1 3 verify
2x 1 3 6x 2 5 1 3 solve and verify
2x 1 3 6x 2 5 1 3 verify
