An older man is walking past writing on a wall.
A man is walking past a wall filled with graffiti.
Writing on a wall is not necessarily graffiti.
exists e1 s1 s2 x1 x2 x3.(on(e1,x3) & n_wall(x3) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_writing(x2) & a_past(s2) & Theme(s2,x2) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3 x4.(past(e1,x2) & with(e2,x4) & n_graffitus(x4) & Theme(e2,x3) & v_fill(e2) & (x2 = x3) & n_wall(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))