A black and white dog is running over grass.
A girl plays baseball.
a dog and girl are not the same.
exists e1 s1 s2 x1 x2.(over(e1,x2) & n_grass(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_white(s2) & Theme(s2,x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_baseball(x2) & n_girl(x1))