A group of pedestrians walk down a city street.
The people are running in a race.
The people cannot both walk and be running at the same time.
exists e1 x1 x2 x3 x4.(down(e1,x3) & n_street(x3) & of(x3,x4) & n_city(x4) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_pedestrian(x2) & n_group(x1))
exists e1 x1 x2.(n_people(x1) & in(e1,x2) & n_race(x2) & Actor(e1,x1) & v_run(e1))