Doctors performing some type of surgery.
Doctors play pool.
Doctors would never be playing pool while performing any type of surgery.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & of(x3,x4) & n_surgery(x4) & n_type(x3) & (x1 = x2) & n_doctor(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_pool(x2) & n_doctor(x1))