A dog jumps of a surfboard
Off of a surfboard a dog jumps
in a both sentence surfboard and off is different
exists x1 x2 x3.(a_topic(x1) & of(x1,x3) & n_surfboard(x3) & n_jump(x1) & of(x1,x2) & n_dog(x2))
exists x1.(ne_nam_off(x1) & all x3 x2.((n_jump(x2) & of(x2,x3) & n_dog(x3)) -> exists x4.(a_topic(x1) & of(x1,x4) & for(x4,x2) & n_surfboard(x4))))