A man painting over graffiti.
A man is using graffiti on his body.
A man is either painting over graffiti or a man is using graffiti on his body, but not both.
exists x1 x2 x3.(a_topic(x1) & over(x1,x3) & n_graffitus(x3) & n_painting(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2 x3.(on(e1,x3) & n_body(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_graffitus(x2) & n_man(x1))