two dancers dance together.
A husband and wife are doing the salsa in the ballroom.
Two dancers do not have to be husband and wife.
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_dance(e1) & n_dancer(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4 x5.(n_ballroom(x5) & n_salsa(x4) & in(e1,x5) & Theme(e1,x4) & Actor(e1,x1) & v_do(e1) & n_wife(x3) & n_husband(x2) & subset_of(x3,x1) & subset_of(x2,x1))