A male is standing in front of a wall will graffiti on the wall.
two boys ride skateboard
Two boys are riding skateboards while one male is standing in front of a wall.
exists e2 e1 x1 x2 x3 x4.(in(e1,x2) & of(x2,x3) & on(e2,x3) & n_wall(x3) & n_wall(x3) & Actor(e2,x4) & v_graffiti(e2) & (x3 = x4) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_male(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_boy(x1) & card_eq_2(x1))