There are three character set of characters present in the given series .
Every sets starting char incremented by one char .
K__,L__,M__,N__ hence in the third set first char must be M . In the second position of missing set F must come hence below sequence is valid for second position characters .
_B_,_D_,_F_,_H_ same way in the third position __H,__J,__L,__N grouping all series together the actual series must be written as followed.
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