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Subj:     Puzzle - Penrose Rhombs (S486c) 
          From: University of Idaho on 5/13/2006
Source: http://www.cs.uidaho.edu/~casey931/puzzle/penrose/penrose.html 

These two rhombs were drawn by the British physicist Roger Penrose, hence they are called Penrose Rhombs.  Try to tile a plane with these two rhombs.  There are only two rules: 
  1. Colors must match at the edges 
  2. Leave no gaps
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