Four dogs run on field
Dogs are playing with each other.
Dogs may run without playing, and dogs may play without playing with each other.
exists e1 x1 x2.(on(e1,x2) & n_field(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_4(x1))
exists e1 x1.(all x2.(n_other(x2) -> with(e1,x2)) & Actor(e1,x1) & v_play(e1) & n_dog(x1))