Three friends stand by the river and talk about old stories.
No one knows each other
If no one knows each other then they cannot be freinds.
exists e1 s1 x1 x2 x3 x4 x5.(n_river(x3) & by(e1,x2) & subset_of(x4,x2) & about(x4,x5) & n_story(x5) & a_old(s1) & Theme(s1,x5) & n_talk(x4) & subset_of(x3,x2) & Actor(e1,x1) & v_stand(e1) & n_friend(x1) & card_eq_3(x1))
-exists x1.(all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_know(e1))) & n_one(x1))