A man demonstrates his product.
The product is a robot.
A robot is not the only product someone can demonstrate.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_demonstrate(e1) & n_product(x2) & of(x2,x1) & n_male(x1) & n_man(x1))
exists p1 x1.(n_product(x1) & exists x2.((x1 = x2) & n_robot(x2)))