Four people stand in the middle of a library gathering children's books.
The four people are friends.
You can not infer they are friends.
exists e1 x1 x2 x3 x4 x5 x6.(n_middle(x2) & in(e1,x2) & of(x2,x6) & n_book(x6) & of(x6,x3) & n_child(x3) & of(x3,x5) & n_gathering(x5) & of(x3,x4) & n_library(x4) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_4(x1))
exists p1 x1.(n_people(x1) & card_eq_4(x1) & exists x2.((x1 = x2) & n_friend(x2)))