theorem Th14:
  |[1,0]| <> |[0,1]| & |[1,0]| <> |[0,0]| & |[0,1]| <> |[0,0]|
  proof
    |[1,0]|`1 = 1 & |[1,0]|`2 = 0 & |[0,1]|`1 = 0 & |[0,1]|`2 = 1 &
    |[0,0]|`1 = 0 & |[0,0]|`2 = 0 by EUCLID:52;
    hence thesis;
  end;
