Comprehension Passage
Directions: Study the information given below carefully and answer the questions that follow.
There are ten shops in the street namely M, N, O, P, Q, R, S, X, Y, Z. They are arranged as follows. M is 20m north of P. O is 5m east of P. Q is 10m north of O. R is 10m east of Q. S is 15m south of R. Y is 15m west of S. N is 10m east of M. Z is 10m south of N. X is 10m east of O.
Four of the five following are alike in a certain way forming a group, which one doesn't belong to the group?
1
OQ
2
XS
3
QR
4
NZ
5
OX