Seven teachers M, N, O, P, Q, R and S take different number of tuitions. P takes more tuitions than S. M takes more tuitions

than Q. R takes the second highest number of tuitions. The number of tuitions that O takes is less than only that of four

teachers. N takes less tuitions than P but more than M. Q takes the least number of tuitions. S takes the second lowest

number of tuitions.

In terms of the number of tuitions taken, who is between N and S?