People are walking through a shopping center.
The people are walking thru the race track.
People cannot walk through a shopping center and a race track at the same time.
exists e1 x1 x2 x3.(through(e1,x2) & n_center(x2) & of(x2,x3) & n_shopping(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(n_track(x2) & of(x2,x3) & n_race(x3) & n_people(x1) & thru(e1,x2) & Actor(e1,x1) & v_walk(e1))