A dog on a leash walks on the sidewalk while another dog follows.
Two dogs walk on the sidewalk towards a grassy area.
Just because two dogs are walking that does not mean they are going towards a grassy area.
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.(n_sidewalk(x2) & towards(e1,x3) & n_area(x3) & a_grassy(s1) & Theme(s1,x3) & on(e1,x2) & Theme(e1,x1) & v_walk(e1) & n_dog(x1) & card_eq_2(x1))