In the given letter-cluster pairs, the first letter-cluster is related to the second letter-cluster following a certain logic. Study the given pairs carefully, and from the given options, select the pair that follows the same logic.
KP : LMQR
TG : UVHI
1
LO : NMQP
2
DW : GHTS
3
HS : IJTU
4
IR : HGST