An elderly man paints a picture of a bird.
There is a man painting a picture of a cat.
The man is either painting a picture of a bird or a cat, but it cannot be both.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_paint(e1) & of(x2,x3) & n_bird(x3) & n_picture(x2) & n_man(x1) & a_elderly(s1) & Theme(s1,x1))
exists p1 x1 e1 x2 x3 x4 x5.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_paint(e1) & of(x4,x5) & n_cat(x5) & n_picture(x4) & (x2 = x3) & n_man(x2))