Two people in masks dancing.
Two people are wearing scary Halloween masks.
All masks are not Halloween masks.
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_dance(e1) & (x1 = x3) & in(x1,x2) & n_mask(x2) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_mask(x2) & (x2 = x3) & ne_geo_halloween(x3) & a_scary(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))