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  Here is an example.
  
a  ... | 9.. | 53.        POK Journal 060430  Five Dark Stars                                
b  43. | 615 | 897        21:07:02.112 060501                                                
c  .9. | .83 | 6..        Iteration counts  1  0  0                                          
   ----+-----+----        Blank cell count 44                                                
d  37. | ... | ..9  
e  2.6 | .9. | 4.3  
f  9.. | 3.. | .8.  
   ----+-----+----  
g  ..3 | 82. | ...  
h  71. | 53. | ..8  
i  ..9 | ..4 | 3..

       1         2         3          4         5         6          7         8         9       
  .---------.---------.---------..---------.---------.---------..---------.---------.---------.  
a |1    6 8 | 2   6 8 |12    78 ||         |   4  7  | 2    7  ||         |         |12 4     | a
b |         |         | 2       ||         |         |         ||         |         |         | b
c |1   5    |         |12  5 7  || 2 4  7  |         |         ||         |12 4     |12 4     | c
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
d |         |         |1  45  8 ||12 4     |   456   |12   6 8 ||12       |12  56   |         | d
e |         |    5  8 |         ||1     7  |         |1     78 ||         |1   5 7  |         | e
f |         |   45    |1  45    ||         |   4567  |12   67  ||12    7  |         |12  56   | f
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
g |    56   |   456   |         ||         |         |1    67 9||1     7 9|1  4567  |1  456   | g
h |         |         | 2 4     ||         |         |     6  9|| 2      9| 2 4 6   |         | h
i |    56 8 | 2  56 8 |         ||1     7  |     67  |         ||         |12  567  |12  56   | i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9       

set b3 = 2.                  2 is unique in cell b3.
set h3 = 4.                  4 is unique in cell h3.
set i2 = 2.                  2 is unique in column 2.
set f2 = 4.                  4 is unique in column 2.
set i1 = 8.                  8 is unique in row i.

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