A snowboarder performs a grab trick in the air.
A snowboarder performs tricks in the air.
If he performs a grab trick, he performs tricks.
exists e1 x1 x2 x3 x4.(n_air(x4) & in(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & of(x2,x3) & n_grab(x3) & n_snowboarder(x1))
exists e1 x1 x2 x3.(n_air(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_snowboarder(x1))