People walk along a sidewalk in a city.
men and women walk on the sidewalk
They could be all men or all women.
exists e1 x1 x2 x3.(along(e1,x2) & in(x2,x3) & n_city(x3) & n_sidewalk(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3 x4.(n_sidewalk(x4) & on(e1,x4) & Actor(e1,x1) & v_walk(e1) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))