BDF, GEC2, DF2H,____, 2FHJ
In the given series first set BDF is reversed in the second set and promoted each character by one and adding 2 in the end . hence second set becoming GEC which is reversed and upgraded form of FDB. In the third set 2 is promoted to third position again remaining characters are upgraded by one character after reversing . Reversal of GEC is CEG, when each letter upgraded to next letter it becomes DFH and 2 comes before H. Following the same logic yields to I2GE as answer .
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