The four children are running to a brick building.
the adults are walking at the track
There can be either children or adults.
exists e1 x1 x2 x3.(n_child(x1) & card_eq_4(x1) & to(e1,x2) & n_building(x2) & of(x2,x3) & n_brick(x3) & Actor(e1,x1) & v_run(e1))
exists e1 x1 x2.(n_track(x2) & n_adult(x1) & at(e1,x2) & Actor(e1,x1) & v_walk(e1))