Black dog rolls head in grass.
Black cat rolls head in grass.
they are doing the same thing and the same color but one is a cat and one is a dog
exists s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_grass(x4) & n_head(x1) & of(x1,x3) & n_roll(x3) & of(x1,x2) & n_dog(x2) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_grass(x4) & Theme(e1,x3) & Actor(e1,x1) & v_roll(e1) & n_head(x3) & n_cat(x1) & (x1 = x2) & ne_nam_black(x2))