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The number of possibilities to place exactly one letter in its correct envelop ________.

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Assume that there are 6 color letters L1, L2, L3, L4, L5 and L6 are to be placed in 6 same color envelop E1, E2, E3, E4, E5 and E6 (one letter for each envelop). The number of possibilities to place exactly one letter in its correct envelop ________.
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