Consider A value as 1 and B values as 2 so on Z value as 26 . A's number is 1 , 1^2 =1 hence next letter is A , third letter is incremented by one of first letter hence it is B . B's value is 2 , s^2=4 and 4's associated letter is D. 5th letter is C which is incremented by one letter of third letter . C's value is 3 , 3^2=9 and 9th letter is I same way for D expression value is 4^2=16 and 16th letter is P .
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