A man is sitting on a stool fishing.
a man sitting on the toilet
The man is either sitting on a stool or a toilet.
exists e1 x1 x2 x3.(on(e1,x2) & n_fishing(x2) & of(x2,x3) & n_stool(x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_toilet(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))