A man with a red shirt on and a backpack is taking pictures of graffiti on a wall.
A man photographs grafitti.
taking pictures of graffiti  is a rephrase of photographs grafitti.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & with(x1,x4) & on(x4,x8) & n_wall(x8) & Theme(e1,x6) & Actor(e1,x5) & v_take(e1) & of(x6,x7) & n_graffitus(x7) & n_picture(x6) & (x4 = x5) & n_backpack(x4) & with(x1,x2) & on(x2,x3) & n_wall(x3) & n_shirt(x2) & a_red(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_photograph(e1) & n_grafittus(x2) & n_man(x1))