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At the time of the school class photo shoot, Dian was in 17th position from the right end and 26th from the left end, as

At the time of the school class photo shoot, Dian was in 17th position from the right end and 26th from the left end, as well as the 3rd position from the front and the 4th rear. If the number of each row decreases one backward, then how many people in the school ?

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