A skateboarder performing a kickflip over short stairs.
The person is participating in extreme sport.
A skateboarder performing a trick is participating in an extreme sport.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_stair(x4) & a_short(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_kickflip(x3) & (x1 = x2) & n_skateboarder(x1))
exists e1 s1 x1 x2.(n_person(x1) & in(e1,x2) & n_sport(x2) & a_extreme(s1) & Theme(s1,x2) & Actor(e1,x1) & v_participate(e1))