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  How is M created from A?

a  ... | ... | ...                                                                           
b  ... | ... | ...        12:46:29.016 060501                                                
c  ... | ... | ...        Iteration counts  0  0  0                                          
   ----+-----+----        Blank cell count 81                                                
d  ... | ..7 | ...  
e  ... | ... | ...  
f  ... | ... | ...  
   ----+-----+----  
g  ... | ... | ...  
h  ... | ... | ...  
i  ... | ... | ...

  When d6 is set to 7 in A,
  
  1.  All the numbers in cell d6 in M are erased.
      This shows no uncertainty remains for cell d6.
      
  2.  All the 7s in column 6 are erased.
      All the 7s in row    d are erased.
      All the 7s in block  5 are erased.
      This shows that 7 is no longer a
        possibility for any of these 20 cells.
        
       1         2         3          4         5         6          7         8         9       
  .---------.---------.---------..---------.---------.---------..---------.---------.---------.  
a |123456789|123456789|123456789||123456789|123456789|123456 89||123456789|123456789|123456789| a
b |123456789|123456789|123456789||123456789|123456789|123456 89||123456789|123456789|123456789| b
c |123456789|123456789|123456789||123456789|123456789|123456 89||123456789|123456789|123456789| c
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
d |123456 89|123456 89|123456 89||123456 89|123456 89|         ||123456 89|123456 89|123456 89| d
e |123456789|123456789|123456789||123456 89|123456 89|123456 89||123456 89|123456789|123456789| e
f |123456789|123456789|123456789||123456 89|123456 89|123456 89||123456 89|123456789|123456789| f
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
g |123456789|123456789|123456789||123456789|123456789|123456 89||123456789|123456789|123456789| g
h |123456789|123456789|123456789||123456789|123456789|123456 89||123456789|123456789|123456789| h
i |123456789|123456789|123456789||123456789|123456789|123456 89||123456789|123456789|123456789| i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9     
       

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