In a word "DISCRIPTION", if all letters are arranged in the alphabetical order, and then the consonants are changed to the 2nd previous letter and the vowels are changed to the next letter as per the English alphabetical series, then how many letters do not repeat more than once?

In a word "DISCRIPTION", if all letters are arranged in the alphabetical order, and then the consonants are changed to the 2nd previous letter and the vowels are changed to the next letter as per the English alphabetical series, then how many letters do not repeat more than once? Correct Answer Six

Given Word: DISCRIPTION

After arranging all letters of the given word in alphabetical order: 

C D I I I N O P R S T

After changing all consonants to the 2nd previous letter and all vowels to the next letter as per the English alphabetical series: 

A B J J J L P N P Q R

Hence, only six letters A, B, L, N, Q and R are not repeating more than once in the above arrangement.

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