Directions: Read the information carefully and answer the question given below:

A school teacher must schedule seven sessions, which are abbreviated M, N, O, P, S, T, and U, during a day. Seven different consecutive time periods are available for the sessions, and are numbered one through seven in the order that they occur. Only one session can be schedules for each period. The assignment of the sessions to the periods is subject to the following restrictions:

M and O must occupy consecutive periods. M must be scheduled for an earlier period than U. 

O must be scheduled for a later period than S. 

If S does not occupy the fourth period, then P must occupy the fourth period. 

U and T cannot occupy consecutively numbered periods.