A woman and a man are dancing in public
A couple is dancing
A woman and a man together are usually considered to be a couple.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_public(x4) & Actor(e1,x1) & v_dance(e1) & subset_of(x3,x1) & n_man(x3) & subset_of(x2,x1) & n_woman(x2))
exists e1 x1.(Actor(e1,x1) & v_dance(e1) & n_couple(x1))