A kayaker in a green boat paddles through the rapids.
A man in a row boat is fishing.
A kayaker cannot simultaneously be in a row boat
exists s1 x1 x2 x3 x4.(n_rapid(x4) & a_topic(x1) & through(x1,x4) & in(x1,x2) & n_paddle(x2) & of(x2,x3) & n_boat(x3) & a_green(s1) & Theme(s1,x2) & n_kayaker(x1))
exists p1 x1 x2 x3.(exists x4.((x1 = x4) & n_fishing(x4)) & in(x1,x2) & n_boat(x2) & of(x2,x3) & n_row(x3) & n_man(x1))