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OI-codes/S2OJ/742/data/data4.in

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x 1 t 1 x 1 t 1 t 1 x 1 x 1 x 1 x 1 x 1 x 1 t 1 t 1 x 1 t 1 x 1 x 1 t 1 x 1 x 1 t 1 x 1 x 1 x 1 x 1 x 1 t 1 x 1 x 1 x 1