people walking on sidewalk in city
The people are shopping at different stores.
People walking on the sidewalk might not be shopping.
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 e1 x1 x2 x3.(n_store(x3) & n_people(x1) & at(e1,x2) & -(x2 = x3) & n_store(x2) & Actor(e1,x1) & v_shop(e1))