Three guys and a girl are all jumping in a pool together.
The people are all friends.
Just because three people are jumping in the pool together does not make them friends.
exists e1 s1 s2 x1 x2 x3 x4.(a_all(s2) & Manner(e1,s2) & a_together(s1) & Manner(e1,s1) & in(e1,x4) & n_pool(x4) & Actor(e1,x1) & v_jump(e1) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_guy(x2) & card_eq_3(x2))
exists p1 x1.(n_people(x1) & all x2.(n_friend(x2) -> (x1 = x2)))