Dear @montaha.rizeq, Thank you for your reply! Very informative and comprehensive! I just edited my post and added résumé. What do you think of résumé then?
It means from the total of all three subzones, you will have 3 R. However, we also know that we can't have R in z1. So, it's their sneaky way of saying 3 R in z2 and z3.
I just looked the game over and the poster above me got it right; E violates the "OR" rule by having neither O nor J. This can't happen because if one is at R then the other MUST be at S. Missing one of the entities forces the other into S.