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Number of permutations of 1, 2, 3, 4, 5,...

Number of permutations of 1, 2, 3, 4, 5, 6, 7, 8, and 9 taken all at a time are such that the digit 1 appearing somewhere to the left of 2 `
` 3 appearing to the left of 4 `
`and 5 somewhere to the left of 6, is `kxx7!` `
`Then the value of `k`` is _________.

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