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

HJM GIM MOS LNR

HJM

HJM ⇒H→(+2)→ J →(+3) → M(ODD) GIM ⇒ G→(+2)→ I →(+4) → M MOS ⇒ M→(+2) → O →(+4) → S LNR ⇒ L→(+2)→ N →(+4) → R