Which letter—cluster will replace the question mark (?) in the following series?
DEY, FFW, IGT, KHR, NIO, ?
$$DEY=4+5+25=34$$
$$FFW=6+6+23=35$$
$$IGT=9+7+20=36$$
$$KHR=11+8+18=37$$
$$NIO=14+9+15=38$$
According to sequence, next term will be
$$PJM=16+10+13=39$$
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