Skier jumping off the edge of a snowy cliff.
The skier is sitting on the edge of the cliff.
Person who is sitting down can not be jumping off a cliff at the same time.
exists e1 s1 s2 x1 x2 x3 x4.(n_edge(x3) & a_topic(x1) & a_off(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_jump(e1) & of(x3,x4) & n_cliff(x4) & a_snowy(s1) & Theme(s1,x4) & (x1 = x2) & n_skier(x1))
exists e1 x1 x2 x3.(n_cliff(x3) & n_edge(x2) & n_skier(x1) & on(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_sit(e1))