A pair of dogs playing with a purple ball.
cats lay in the sun
Dogs are not the same as cats.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & with(e1,x4) & n_ball(x4) & a_purple(s1) & Theme(s1,x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_dog(x2) & n_pair(x1))
exists e1 x1 x2.(n_sun(x2) & in(e1,x2) & Actor(e1,x1) & v_lay(e1) & n_cat(x1))