two dogs play together.
Two dogs play with each other.
Play together is the same as play with each other.
exists e1 s1 x1.(a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1.(all x2.(n_other(x2) -> with(e1,x2)) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))