A white dog runs on the grass.
A black cat sits in the hedges.
a white dog is not the same as a black cat.
exists e1 s1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_white(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_hedge(x2) & in(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_cat(x1) & a_black(s1) & Theme(s1,x1))