Four people are sitting behind a table full of food.
The people are on a rollercoaster
The people cannot be on a rollercoaster and sitting behind a table at the same time.
exists e1 s1 x1 x2 x3 x4.(behind(e1,x2) & of(s1,x4) & n_food(x4) & Theme(s1,x3) & a_full(s1) & (x2 = x3) & n_table(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))
exists p1 x1.(n_people(x1) & exists x2.(on(x1,x2) & n_rollercoaster(x2)))