FAG, GAF, HAI, IAH, ____

BCB, DED, FGF, HIH, ___

ELFA, GLHA, ILJA, _____, MLNA

Choose the group of letters which is different from others.

In the series of letters given below, which option will come in the place of question mark (?)? BXF, DVI, FTL, HRO, ?

CMM, EOO, GQQ, _____, KUU