A child is playing at a park.
The child is at school.
The child is either at school or a park.
exists e1 x1 x2.(at(e1,x2) & n_park(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))
exists p1 x1.(n_child(x1) & exists x2.(at(x1,x2) & n_school(x2)))