A man climbing the side of a cliff.
The man does not know how to rock climb; he fell into a canyon.
If a man is climbing, he cannot have fallen.
exists e1 x1 x2 x3 x4.(n_side(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & of(x3,x4) & n_cliff(x4) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_male(x1) & n_man(x1) & into(e1,x2) & n_canyon(x2) & Actor(e1,x1) & v_fall(e1) & -exists e2 x3.(Topic(e2,x3) & Actor(e2,x1) & v_know(e2) & n_manner(x3) & exists e3 x4 x5.(Theme(e3,x5) & Actor(e3,x4) & v_rock(e3) & n_climb(x5))))