Two ladies dancing on stage.
A couple of women are dancing a duet for the audience.
Not all two ladies dancing on stage are dancing a duet for the audience.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_stage(x3) & Actor(e1,x2) & v_dance(e1) & (x1 = x2) & n_lady(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_audience(x4) & for(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_dance(e1) & n_duet(x3) & of(x1,x2) & n_woman(x2) & n_couple(x1))