Answer
34650 distinguishable permutations.
Work Step by Step
1 M, 4 I's, 4 S's and 2 P's. Total: 11 letters.
$\frac{11!}{1!~4!~4!~2!}=\frac{11\times10\times9\times8\times7\times6\times5\times4!}{4!\times24\times2}=34650$
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