Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
GA, MU, SO, ?, EC
GA ==> (G+6) (A-6) ==>Â MU
MU ==> (M+6) (U-6) ==>Â SO
SO ==> (S+6) (O-6) ==> YI
YI ==> (Y+6) (I-6) ==>Â EC
Hence 'YI' will come in place of the question mark.
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