Two women are dancing while men play music behind them.
Two women dance.
Two women who are dancing equals two women who are in a dance.
exists e1 p1 x1.(exists e2 x2 x3.(behind(e2,x1) & Theme(e2,x3) & Actor(e2,x2) & v_play(e2) & n_music(x3) & n_man(x2)) & n_thing(x1) & while(e1,p1) & Actor(e1,x1) & v_dance(e1) & n_woman(x1) & card_eq_2(x1))
exists s1 x1 x2.(n_dance(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x2) & n_woman(x2) & card_eq_2(x1) & a_topic(x1))