Two ladies dancing on stage.
two women are performing for an audience.
Just because two ladies dancing on stage does not imply that they are performing for an 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.(for(e1,x2) & n_audience(x2) & Actor(e1,x1) & v_perform(e1) & n_woman(x1) & card_eq_2(x1))