a skateboarder has kicked his board up onto its back wheels in an indoor skate center.
A skateboard is on two wheels.
a skateboarder is riding his skateboard on his two back wheels
exists e1 s1 s2 x1 x2 x3 x4 x5.(in(e1,x4) & n_center(x4) & of(x4,x5) & n_skate(x5) & a_indoor(s2) & Theme(s2,x4) & onto(e1,x3) & n_wheel(x3) & a_back(s1) & Theme(s1,x3) & of(x3,x1) & n_thing(x1) & r_up(e1) & Theme(e1,x2) & Actor(e1,x1) & v_kick(e1) & n_board(x2) & of(x2,x1) & n_male(x1) & n_skateboarder(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_wheel(x2) & card_eq_2(x2)) & n_skateboard(x1))