Select the letter-cluster that can replace the question mark (?) in the following series.
GAM, DCJ, AEG, XGD, ?
GAM ==> (G-3) (A+2) (M-3)Â ==> DCJ
DCJ ==>Â (D-3)Â (C+2) (J-3)Â ==> AEG
AEG ==>Â (A-3)Â (E+2) (G-3)Â ==> XGD
XGD ==> (X-3)Â (G+2)Â (D-3)Â ==> UIA
So 'UIA' will come in place of the question mark.
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