Two men and one woman are dressed in costume hats.
the people are swingers
Men and women in costumes are not all swingers.
exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_hat(x4) & a_costume(s1) & Theme(s1,x4) & Theme(e1,x1) & v_dress(e1) & n_woman(x3) & card_eq_1(x3) & n_man(x2) & card_eq_2(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists p1 x1.(n_people(x1) & exists x2.((x1 = x2) & n_swinger(x2)))