A man on the beach is taking a picture of another man.
A person is taking a picture of another person.
A man is taking a picture of another man. Another man is another person.
exists e1 x1 x2 x3 x4.(n_beach(x2) & Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & of(x3,x4) & n_man(x4) & -(x4 = x1) & n_man(x1) & n_man(x1) & n_picture(x3) & on(x1,x2))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & of(x2,x3) & n_person(x3) & -(x3 = x1) & n_person(x1) & n_person(x1) & n_picture(x2))