Children are playing on the swings at a park.
Children are eating lunch in the cafeteria.
The children cannot be playing on the swings at a park at the same time they are eating lunch in the cafeteria.
exists e1 x1 x2 x3.(n_swing(x2) & at(e1,x3) & n_park(x3) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))
exists e1 x1 x2 x3.(n_cafeteria(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_lunch(x2) & n_child(x1))