How many different words can be formed by jumbling the letters in the word MISSISSIPPI in which no two S are adjacent?

Question

$8.{}^6{C_4}.{}^7{C_4}$

$6.7.{}^8{C_4}$

$6.8.{}^7{C_4}$.

$7.{}^6{C_4}.{}^8{C_4}$

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