A surgeon and surgical staff operating on a patient.
A surgeon is doing a hip replacement.
the surgeon operating the patient does not imply he is doing a hip replacement surgery
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 e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_replacement(x2) & of(x2,x3) & n_hip(x3) & n_surgeon(x1))