A woman with a dog canoe down a river.
A person is in a canoe with a dog.
A person is in a canoe with a dog refers to a woman
exists x1 x2 x3 x4.(a_topic(x1) & down(x1,x4) & n_river(x4) & with(x1,x2) & n_canoe(x2) & of(x2,x3) & n_dog(x3) & n_woman(x1))
exists p1 x1.(exists x2 x3.(in(x1,x2) & with(x2,x3) & n_dog(x3) & n_canoe(x2)) & n_person(x1))