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\centerline{\psfig{figure=SemiRegular.ps,height=3.25in}} 
\centerline{ The 8 SemiRegular, or Archimedean, tesselations\footnote{
  figure from {\tt http://mathworld.wolfram.com/SemiregularTessellation.html}}}

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\centerline{\psfig{figure=DemiRegular.ps,height=4in}}
\centerline{ The 20 DemiRegular, or 2-transitive, tesselations\footnote{
  figure from {\tt http://mathworld.wolfram.com/DemiregularTessellation.html}}}


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