Two people in black hats are standing behind a counter.
Two people in white caps are sitting on a chair.
Black hats and white caps  cannot be worn at the same time.
exists e1 s1 x1 x2 x3.(behind(e1,x3) & n_counter(x3) & Actor(e1,x1) & v_stand(e1) & in(x1,x2) & n_hat(x2) & a_black(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_chair(x3) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_cap(x2) & a_white(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))