A girl looking at some pictures on a wall.
Bill took pictures.
Girls are not named Bill, so the girl and Bill cannot be the same person
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_wall(x4) & at(e1,x3) & n_picture(x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_girl(x1))
exists e1 x1 x2.(ne_nam_bill(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_picture(x2))