Multiple couples participate in a dance contest.
Couples are in a dance contest.
If the couples participate in the dance contest then they are in a contest.
exists e1 x1 x2 x3 x4.(in(e1,x3) & n_contest(x3) & of(x3,x4) & n_dance(x4) & Actor(e1,x1) & v_participate(e1) & n_couple(x1) & (x1 = x2) & ne_nam_multiple(x2))
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_contest(x2) & of(x2,x3) & n_dance(x3)) & n_couple(x1))