A snowboard rider jumping high on his snowboard in the snow.
The rider is on a snowboard.
If a rider is on a snowboard then they are a snowboard rider.
exists e1 p1 x1 x2 x3 x4.(n_snow(x4) & a_topic(x1) & in(e1,x4) & on(e1,x2) & n_snowboard(x2) & n_snowboard(x2) & of(x2,x1) & n_male(x1) & exists s1.(Theme(s1,x3) & a_high(s1)) & Topic(e1,p1) & Actor(e1,x3) & v_jump(e1) & (x1 = x3) & n_rider(x1) & of(x1,x2))
exists p1 x1.(n_rider(x1) & exists x2.(on(x1,x2) & n_snowboard(x2)))