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

BGL PUZ AFK NSW

NSW

BGL ⇒ B → (+5) → G → (+5) → L PUZ ⇒ P → (+5) → U → (+5) → Z AFK ⇒ A → (+5) → F → (+5) → K NSW ⇒ N → (+5) → S → (+4) → W (ODD)