a snowboarder
A skier goes down a mogul run.
A person cannot be a snowboarder and skier at the same time.
exists x1.(a_topic(x1) & n_snowboarder(x1))
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_run(x2) & of(x2,x3) & n_mogul(x3) & n_skier(x1))