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

PMJG

THE LOGIC;

1) YWTP,

Y → (-2) → W → (-3) → T → (-4) → P

2) PMJG,

P → (-3) → M → (-3) → J → (-3) → G

3) MKHD,

M → (-2) → K → (-3) → H → (-4) → D

4) USPL,

U → (-2) → S → (-3) → P → (-4) → L

Thus, PMJG is the odd one.