Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter cluster.

NOSV TWZC PSVY EHKN

NOSV

THE LOGIC; 1) NOSV, N → (+1) → O  S → (+3) → V 2) TWZC, T → (+3) → W Z → (+3) → C 3) PSVY, P → (+3) → S V → (+3) → Y 4) EHKN, E → (+3) → H K → (+3) → N Thus, NOSV is the odd one.