Select the letter-cluster that can replace the question mark (?) in the following series. PERSONA, ANPERSO, ANOSPER, ?

Select the letter-cluster that can replace the question mark (?) in the following series. PERSONA, ANPERSO, ANOSPER, ? Correct Answer ANOSREP

The pattern followed is,

In the second term the last two letters of the first term are placed at the beginning.

In the third term the last two letters are placed in the middle, they are shifted by two positions.

Similarly,

The term which will come in the series is,

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