A wakeboarder is attempting a trick while holding on to lines pointed upward.
A person is riding a wakeboard.
a wakeboarder attempting a trick implies riding a wakeboard
exists e2 e3 e1 s1 x1 x2 x3 x4.(while(e1,e2) & r_on(e2) & to(e2,x3) & a_upward(s1) & Manner(e3,s1) & Actor(e3,x4) & v_point(e3) & (x3 = x4) & n_line(x3) & Actor(e2,x1) & v_hold(e2) & Theme(e1,x2) & Actor(e1,x1) & v_attempt(e1) & n_trick(x2) & n_wakeboarder(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_wakeboard(x2) & n_person(x1))