people walking on sidewalk in city
The people are outdoors.
A sidewalk is located outdoors.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_city(x4) & on(e1,x3) & n_sidewalk(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists p1 x1.(n_people(x1) & exists x2.((x1 = x2) & n_outdoors(x2)))