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Leave is: 
(a1, b6)          (a2, d6)          (a3, b3)          
(a4, d7)          (a5, d6)          (a6, c4)          
(a7, c6)          (b1, d3)          (b2, c3)          
(b4, d4)          (b5, d1)          (b7, c2)          
(c1, d6)          (c5, d2)          (c7, d5)          
----------------------------------------------------------------------------
Triangles are: 
  1: (a3 b7 c3 )    2: (b3 c3 d2 )    3: (a5 b7 d1 )    4: (b3 c6 d5 )  
  5: (a2 b6 c6 )    6: (b4 c4 d3 )    7: (a1 c3 d4 )    8: (a1 b1 d6 )  
  9: (a4 b4 c3 )   10: (b2 c7 d2 )   11: (b4 c6 d1 )   12: (a4 b6 c1 )  
 13: (a5 c2 d2 )   14: (a6 b1 c3 )   15: (b7 c7 d3 )   16: (b6 c4 d2 )  
 17: (a4 b2 d4 )   18: (a2 b1 d4 )   19: (b6 c7 d4 )   20: (b7 c4 d6 )  
 21: (a7 b6 d6 )   22: (a5 c3 d5 )   23: (a2 b5 d2 )   24: (a2 b2 c2 )  
 25: (a7 c3 d7 )   26: (a7 b3 c7 )   27: (a6 b5 c1 )   28: (a2 b7 d7 )  
 29: (a4 c7 d6 )   30: (a2 c5 d1 )   31: (a7 b2 d5 )   32: (b5 c3 d6 )  
 33: (a5 b5 c7 )   34: (b2 c5 d7 )   35: (b3 c4 d7 )   36: (a6 b2 d6 )  
 37: (a6 b4 d2 )   38: (a7 c4 d1 )   39: (a6 c7 d1 )   40: (b1 c2 d1 )  
 41: (a6 c2 d5 )   42: (a3 b4 d7 )   43: (b1 c1 d5 )   44: (a7 b7 c5 )  
 45: (a1 b5 c5 )   46: (a4 c2 d3 )   47: (a7 b4 c1 )   48: (a4 b3 d1 )  
 49: (a1 b4 d5 )   50: (a7 c2 d4 )   51: (a2 c4 d5 )   52: (a4 c6 d2 )  
 53: (a2 b3 c1 )   54: (a1 c1 d1 )   55: (a3 b1 c7 )   56: (b6 c3 d1 )  
 57: (a6 b6 d7 )   58: (b5 c6 d4 )   59: (a6 b7 c6 )   60: (a7 b1 d2 )  
 61: (a4 b5 c4 )   62: (b5 c2 d7 )   63: (a3 b6 c2 )   64: (a3 b5 d5 )  
 65: (a1 b2 c4 )   66: (a6 b3 d3 )   67: (a5 b3 d4 )   68: (a3 b2 d1 )  
 69: (b4 c2 d6 )   70: (a5 b6 d3 )   71: (a3 c4 d4 )   72: (a1 c6 d3 )  
 73: (a5 b4 c5 )   74: (a3 c5 d3 )   75: (a3 c6 d6 )   76: (a4 b7 d5 )  
 77: (a1 b3 c2 )   78: (a6 c5 d4 )   79: (a7 b5 d3 )   80: (b3 c5 d6 )  
 81: (b7 c1 d4 )   82: (b1 c6 d7 )   83: (b2 c1 d3 )   84: (a4 b1 c5 )  
 85: (a1 c7 d7 )   86: (a5 c1 d7 )   87: (b6 c5 d5 )   88: (a5 b1 c4 )  
 89: (a3 c1 d2 )   90: (a2 c3 d3 )   91: (a2 b4 c7 )   92: (a1 b7 d2 )  
 93: (a5 b2 c6 )  
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