Answer: Given
D4P:H4L::P5R:?
H4L to D4P
In this case, 4 is added to the first word – D to EFGH.
The same 4 is subtracted in the last term – P to ONML
As a result, for P5R
Add 5-QRSTU to the first word P.
Subtract 5 – QPONM from the last word R.
As a result, P5R: U5M
As a result, D4P:H4L::P5R: U5M D4P:H4L::P5R: U5M