EX04 is related to ZS16 in a certain way. In the same way, UN06 is related to PI36. To which of the following is WP07 related,following the same logic?

EX04 → ZS16

UN06 → PI36

WP07 → ?

Logic: Letters - 5 and the square of the numbers.

E - 5 = Z

X - 5 = S

4² = 16

Thus, EX04 → ZS16.

U - 5 = P

N - 5 = I

6² = 36

Thus, UN06 → PI36.

W - 5 = R

P - 5 = K

7² = 49

Thus, WP07 → RK49.