Four people are sitting behind a table full of food.
The people are standing in front of the empty table
The people cannot stand in front of and be sitting behind a table at the same time. The table cannot be empty and full of food 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 e1 s1 x1 x2 x3.(n_table(x3) & a_empty(s1) & Theme(s1,x3) & n_people(x1) & in(e1,x2) & of(x2,x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1))