Select the letter-pair that can replace the question mark (?) in the following series.
KP, HM, EJ, BG, ?
In each letter cluster (-3) is done to obtain the next term.
KP ==>Â K-3 P-3Â ==>Â HM
HM ==>Â H-3Â M-3 ==>Â EJ
EJ ==>Â E-3Â J-3 ==>Â BG
BG ==>Â B-3Â G-3 ==> YD
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