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If they can stand in rows of 5 the total number must be a multiple of 5. Also, if they can stand in rows of 6 the total number must be a multiple of 6. The smallest such number is the least common multiple of 5 and 6, which is 30.

So there can by 6 rows of 5-in-a-row or 5 rows of 6-in-a-row.

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