how may different words ca be formed from the letters of the word INTERFERENCE if no two consonants are to be together

INTERFERENCEThere is 5 vowels:- I,E,E,E,E7 consonants:-N,T,R,F,R,N,CThere are 6 spaces to place consonats . so that they are not together.But , we have to place 7 consonants.Therefore , no word can be formed , two consonants are not together.

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