A surgeon and surgical staff operating on a patient.
A surgical operation
surgeon operating a patient shows that it is a  surgical operation
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(s1) & on(e1,x4) & n_patient(x4) & Actor(e1,x3) & v_operate(e1) & (s1 = x3) & n_staff(x2) & a_surgical(s2) & Theme(s2,x2) & n_surgeon(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists s1 x1.(a_topic(x1) & n_operation(x1) & a_surgical(s1) & Theme(s1,x1))