How many distinguishable permutations of the letters of the word CONCLUSIONS?

Hint - Watch this video:

https://www.youtube.com/watch?v=jXpA-1KTfF8&feature=emb_title

CONCLUSIONS ==11 LETTERS

 

11! / [2!2!2!2!]==11! / 16 ==2,494,800 - distinct permutations.