A black dog running in a race.
The white dog is on a beach.
There can be either black or white dog and also it may be in a race or on a beach/
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_race(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists p1 s1 x1.(n_dog(x1) & a_white(s1) & Theme(s1,x1) & exists x2.(on(x1,x2) & n_beach(x2)))