A man paints a picture of a dog.
The man is an alien.
A man cannot be an alien.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_paint(e1) & of(x2,x3) & n_dog(x3) & n_picture(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_alien(x2)))