Two girls are walking along the street and talking.
These girls are childhood friends.
The fact that the girls are walking along the street and talking doesn't imply that they are childhood friends.
exists e2 e1 x1 x2 x3.(n_street(x2) & Actor(e2,x3) & v_talking(e2) & n_girl(x3) & card_eq_2(x3) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1) & card_eq_2(x1))
exists p1 x1.(n_girl(x1) & exists x2 x3.((x1 = x2) & n_friend(x2) & of(x2,x3) & n_childhood(x3)))