Two surgeons performing a surgery.
Two doctors are playing golf.
Doctors do not have to be surgeons.  Doctors are either playing golf or performing surgery.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_surgery(x3) & (x1 = x2) & n_surgeon(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_golf(x2) & n_doctor(x1) & card_eq_2(x1))