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If the first three letters of the word c o m p r e h e n s i o n are reversed, then last three letters are added and then last three remaining letters are reversed and added then which is the letter taht occur exactly in the middle which letter will be fifth from the end try it out in few minutes!!!!!!!!!!!!!

I think the letter that occur exactly in the middle is O and also the letter that will be fifth from the end is also O. Is my answer right?
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