A large brown dog and a larger black dog playing together with a ball.
The dogs are friends.
Two dogs playing together need not mean that they are friends.
exists e1 s1 s2 s3 s4 s5 s6 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & with(e1,x4) & n_ball(x4) & a_together(s6) & Manner(e1,s6) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_dog(x2) & a_black(s5) & Theme(s5,x2) & r_more(s4) & a_large(s4) & Theme(s4,x2) & subset_of(x1,s1) & n_dog(x1) & a_brown(s3) & Theme(s3,x1) & a_large(s2) & Theme(s2,x1))
exists p1 x1.(n_dog(x1) & exists x2.((x1 = x2) & n_friend(x2)))