Select the letter-pair that can replace the question mark (?) in the following series.
JL, GJ, DH, AF, ?
JL ==>Â (J-3) (L-2) ==> GJ
GJÂ ==> (G-3)Â (J-2) ==> DH
DHÂ ==> (D-3)Â (H-2) ==> AF
AFÂ ==> (A-3) (F-2) ==> XD
Hence 'XD' will come in place of question mark.
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