A person is in an operating room.
A doctor preparing to perform surgery.
person doesn't mean doctor
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_room(x2) & of(x2,x3) & n_operating(x3)) & n_person(x1))
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_prepare(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_perform(e2) & n_surgery(x3)) & (x1 = x2) & n_doctor(x1))