A brick wall has colorful graffiti on it.
A wall is blank and white.
A blank wall excludes being covered in colorful graffiti.
exists e1 s1 x1 x2 x3.(on(e1,x1) & n_thing(x1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_graffitus(x3) & a_colorful(s1) & Theme(s1,x3) & n_wall(x1) & of(x1,x2) & n_brick(x2))
exists s1 s2 x1 x2.(Theme(s2,x2) & a_white(s2) & n_wall(x2) & Theme(s1,x1) & a_blank(s1) & n_wall(x1))