A wakeboarder is performing a trick on a rail.
A sport person is performing a sport activity.
wakerboarder is a sport person. Trick on a rail a sport activity.
exists e1 x1 x2 x3.(on(e1,x3) & n_rail(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_wakeboarder(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_activity(x3) & of(x3,x4) & n_sport(x4) & n_person(x1) & of(x1,x2) & n_sport(x2))