0.  u=[   ]  w = 1
  0.  u=[aba]  w = -10
  0.  u=[aca]  w = -1
  0.  u=[cba]  w = -10

  0.  u=[cca]  w = -1
  0.  u=[bab]  w = -10
  0.  u=[bcb]  w = -1

  0.  u=[ aa]  w = -1
  0.  u=[baa]  w = 1

  0.  u=[ ca]  w = -1
  0.  u=[bca]  w = 1

  0.  u=[ bb]  w = -1
  0.  u=[abb]  w = 1
  0.  u=[cbb]  w = 1

  0.  u=[cab]  w = -10
  0.  u=[aab]  w = -10

  0.  u=[bcc]  w = 1