This is a part of hospital diagram.

Each nurse can be assigned to different wards on different days of the week so a nurse must be supervised by another one who is assigned to the same ward on the same day of the week as the nurse or the nurse may be supervised by different nurses on different days of the week, but both the nurse and the supervisor nurse must be assigned to the same ward on the same day in which the supervision takes place.

can anyone please help me..?