The plan of an office block for six officers A, B, C, D, E and F is a follows : Both B and C occupy office to the right of the corridor (as one enters the office block) and A occupies on the left of the corridor. E and F occupy office on opposite sides of the corridor but their offices do not face each other. The offices of C and D face each other. E does not have a corner office. F's office is further down the corridor than A's, but on the same side.