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By: a guest on Sep 11th, 2011  |  syntax: None  |  size: 0.42 KB  |  views: 67  |  expires: Never
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  1. CROSSOVER:
  2.  
  3.     *
  4.  *******
  5.  * *** *
  6. y*******x   // cover with 8 dominoes
  7.   *****
  8.    X*Y
  9.  
  10.  
  11. X/Y both protrude implies x/y both protrude:
  12.  
  13.     A
  14.  BBBACCC
  15.  * DAE *
  16. FFFDGEHHH
  17.   *DGE*
  18.    *G*
  19.  
  20. X protrudes implies x protrudes:
  21.  
  22.     *
  23.  ABBBCCC
  24.  A DDD *
  25. *AEEEFGGG
  26.   HHHF*
  27.    **F
  28.  
  29. Neither protrudes implies neither protrudes:
  30.  
  31.     *
  32.  AAABBBC
  33.  * DDD C
  34. *EEEFFFC*  // unsymmetrical tiling!
  35.   GGG**
  36.    HHH
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