exercise5

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       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| 2      9|         | g
h |  3 5    |         |         ||         |         |    5  8 ||         |  3    8 |         | h
i |         |         | 2     8 ||         |         |    5  8 || 2  5  89| 2      9|         | i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9       

* g8,i8 monop 29
not g7 i7 2 9

  This leads to . . .