Correction

Many thanks to Josh Mailman of the NYC area (I assume from his email at my old ISP, panix.com), for correcting some errors on the Uniqueness example that I provided. The original table looked thus:

   0:    {0, 2, 4, 5, 6, 9, 10}
*  2:    {0, 2, 3, 4, 7, 9, 11}
   4:    {0, 1, 2, 5, 6  8, 10}
*  5:    {0, 1, 4, 5, 6, 9, 11}
   6:    {0, 3, 4, 6, 8,10, 11}
*  9:    {0, 1, 3, 4, 7, 8,  9}
  10:    {0, 2, 4, 6, 7, 8, 11}

Josh was kind enough to alert me to the fact that it should appear like this:

   0:    {0, 2, 4, 5, 6, 9, 10}
*  2:    {0, 2, 3, 4, 7, 8, 11}
   4:    {0, 1, 2, 5, 6  8, 10}
*  5:    {0, 1, 4, 5, 7, 9, 11}
   6:    {0, 3, 4, 6, 8,10, 11}
*  9:    {0, 1, 3, 5, 7, 8,  9}
  10:    {0, 2, 4, 6, 7, 8, 11}