A dog on a leash walks on the sidewalk while another dog follows.
Two dogs walk with their owners down an empty street.
There may not be their owners.
exists e1 p1 x1 x2 x3.(n_sidewalk(x3) & exists e2 x4.(Actor(e2,x4) & v_follow(e2) & n_dog(x4) & -(x4 = x1)) & n_dog(x1) & n_dog(x1) & while(e1,p1) & on(e1,x3) & Actor(e1,x1) & v_walk(e1) & on(x1,x2) & n_leash(x2))
exists e1 s1 x1 x2 x3.(down(e1,x3) & n_street(x3) & a_empty(s1) & Theme(s1,x3) & with(e1,x2) & n_owner(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & card_eq_2(x1))