A man spray paints graffiti art on the size of a concrete wall.
A man is cleaning a wall.
The man is either painting graffiti art, or cleaning the wall.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_size(x5) & Theme(e1,x4) & Actor(e1,x1) & v_graffiti(e1) & on(x4,x5) & of(x5,x6) & n_wall(x6) & a_concrete(s1) & Theme(s1,x6) & n_art(x4) & n_paint(x1) & of(x1,x3) & n_spray(x3) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_wall(x2) & n_man(x1))