A group of young men are gathered under a tree.
A group of men were all friends.
Not all men are friends.
exists e1 s1 x1 x2 x3.(under(e1,x3) & n_tree(x3) & Theme(e1,x1) & v_gather(e1) & of(x1,x2) & n_man(x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists p1 x1 x2.(all x3.(n_friend(x3) -> (x1 = x3)) & of(x1,x2) & n_man(x2) & n_group(x1))