A man and a woman on stage performing a dance.
Two people dancing on stage.
A man and a woman  implies two people.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & Theme(e1,x5) & Actor(e1,x4) & v_perform(e1) & n_dance(x5) & (x2 = x4) & on(x2,x3) & n_stage(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_stage(x3) & Actor(e1,x2) & v_dance(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))