A black dog and a white dog play with each other and a green ball.
Two dogs play.
a black dog and a white dog is two total dogs. the dogs play with each other in both sentences.
exists s1 s2 s3 s4 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & with(x2,x4) & subset_of(x5,x4) & n_ball(x5) & a_green(s4) & Theme(s4,x5) & all x6.(n_other(x6) -> subset_of(x6,x4)) & n_play(x2) & of(x2,x3) & n_dog(x3) & a_white(s3) & Theme(s3,x2) & subset_of(x1,s1) & n_dog(x1) & a_black(s2) & Theme(s2,x1))
exists s1 x1 x2.(n_play(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x2) & n_dog(x2) & card_eq_2(x1) & a_topic(x1))