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Sep 11th, 2011
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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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