Two ladies are walking on the road.
A lady and her friend are hitchhiking.
Just because two women are walking on the road doesn't mean that they are friends, nor do we know if they are hitchhiking.
exists e1 x1 x2.(n_road(x2) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_lady(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(Actor(e1,x1) & v_hitchhike(e1) & subset_of(x3,x1) & n_friend(x3) & of(x3,x2) & n_female(x2) & subset_of(x2,x1) & n_lady(x2))