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

ADHM ORVA ILPU YVRO

YVRO

ADHM = A → (+3) → D → (+4) → H → (+5) → M  ORVA = O → (+3) → R → (+4) → V → (+5) → A ILPU =  I → (+3) → L → (+4) → P → (+5) → U YVRO = Y → (-3) → V → (-4) → R → (-3) → O (THIS IS ODD)