A skateboarder performs tricks on a ramp in front of a wall with graffiti.
A skater sitting down.
A skater cannot be sitting down and performing tricks at the same time.
exists e1 x1 x2 x3 x4 x5 x6.(in(e1,x4) & of(x4,x5) & with(x5,x6) & n_graffitus(x6) & n_wall(x5) & n_front(x4) & on(e1,x3) & n_ramp(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_skateboarder(x1))
exists e1 s1 x1 x2.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_skater(x1))