A kayaker in a green boat paddles through the rapids.
A man in a boat goes down the rapids.
The green boat is a kayak that contains a man going through the rapids.
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 e1 x1 x2 x3.(n_rapid(x3) & down(e1,x3) & Actor(e1,x1) & v_go(e1) & in(x1,x2) & n_boat(x2) & n_man(x1))