AZ 1 is related to CX 3 in a certain way based on the English alpha-numerical order. In the same way, EV 5 is related to GT 7. To which of the following is IR 9 related, following the same logic?

AZ 1 is related to CX 3

EV 5 is related to GT 7

IR 9 is related to ?

​First letter: +2 letters
​Second letter: -2 letters
Number: +2

First pair:
A + 2 → C
Z - 2 → X
1 + 2 → 3

Second pair:
E + 2 → G
V - 2 → T
5 + 2 → 7

Third pair:
I + 2 → K
R - 2 → P
9 + 2 → 11