A man is sitting on the roof.
A man is sitting on the porch.
The man is sitting either on the roof or on the porch.
exists e1 x1 x2.(n_roof(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 x1 x2.(n_porch(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))