A person wearing a yellow helmet is climbing a cliff.
A person is sliding down the cliff.
The person  is either climbing the cliff or sliding down.
exists e2 e1 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_climb(e2) & n_cliff(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & a_yellow(s1) & Theme(s1,x3) & (x1 = x2) & n_person(x1))
exists e1 s1 x1 x2.(n_cliff(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1) & n_person(x1))