A black dog is running in the grass.
The white dog is running in the grass.
There is a black dog and then a white dog.
exists e1 s1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_grass(x2) & n_dog(x1) & a_white(s1) & Theme(s1,x1) & in(e1,x2) & Actor(e1,x1) & v_run(e1))