A woman is sitting at a telescope.
The woman is siting on the moon.
One cannot be sitting at a telescope and on the moon simultaneously.
exists e1 x1 x2.(at(e1,x2) & n_telescope(x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))
exists e1 x1 x2.(n_moon(x2) & n_woman(x1) & on(e1,x2) & Actor(e1,x1) & v_site(e1))