exercise3

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       1         2         3          4         5         6          7         8         9       
  .---------.---------.---------..---------.---------.---------..---------.---------.---------.  
a |         |         | 2      9|| 2     89|  3     9|         || 23    89|         |         | a
b |         |         |         || 2  5   9|         |         || 2  5   9|         | 2  5   9| b
c | 2      9|         |         || 2 45  89|  345   9| 2345  8 ||         | 23    89| 2  5   9| c
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
d |         |  3  6 8 |       89||12  5    |  3 5    |123 5    ||         |12   6  9| 2      9| d
e |         |         |         ||         |         |         ||         |         |         | e
f |  3     9|  3  6   |         ||12 4     |         |1234     || 2      9|12   6  9|         | f
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
g | 23 5    |  3    8 |         ||1  45  89|   45   9|1  45  8 || 23 5  89| 23    89|         | g
h |  3 5    |         |         ||         |         |    5  8 ||         |  3    8 |         | h
i |         |         | 2     8 ||         |         |    5  8 || 2  5  89| 2     89|         | i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9       
* h6,i6 = 58 => no other 5's or 8's in col and blk.
not c6 d6 g4 g5 g6 5 8

* f7, d9 monop 29 =>
not d8 f8 2 9

* b7,b9,c9 monop 259 =>
not a7 c8 2 5 9

      1         2         3          4         5         6          7         8         9       
  .---------.---------.---------..---------.---------.---------..---------.---------.---------.  
a |         |         | 2      9|| 2     89|  3     9|         ||  3    8 |         |         | a
b |         |         |         || 2  5   9|         |         || 2  5   9|         | 2  5   9| b
c | 2      9|         |         || 2 45  89|  345   9| 234     ||         |  3    8 | 2  5   9| c
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
d |         |  3  6 8 |       89||12  5    |  3 5    |123      ||         |1    6   | 2      9| d
e |         |         |         ||         |         |         ||         |         |         | e
f |  3     9|  3  6   |         ||12 4     |         |1234     || 2      9|1    6   |         | f
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
g | 23 5    |  3    8 |         ||1  4    9|   4    9|1  4     || 23 5  89| 23    89|         | g
h |  3 5    |         |         ||         |         |    5  8 ||         |  3    8 |         | h
i |         |         | 2     8 ||         |         |    5  8 || 2  5  89| 2     89|         | i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9