A wakeboarder performs a flip while being towed at high speed.
The wakeboarder is in a competition.
A wakeboarder does not have to be in a competition to perform flips.
exists e1 e2 s1 x1 x2 x3.(while(e1,e2) & at(e2,x3) & n_speed(x3) & a_high(s1) & Theme(s1,x3) & Theme(e2,x1) & v_tow(e2) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_flip(x2) & n_wakeboarder(x1))
exists p1 x1.(n_wakeboarder(x1) & exists x2.(in(x1,x2) & n_competition(x2)))