simpded2

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       1         2         3          4         5         6          7         8         9       
  .---------.---------.---------..---------.---------.---------..---------.---------.---------.  
a | 2 4  7  |   4     |   4  7  ||         |         |         ||         |         |         | a
b |         |  34     |         ||12 4     |         | 2 4     || 2345    |         | 2345    | b
c |         |  34   8 |1 34  78 ||12 4  7  |         | 2 4  7  || 234     |         | 234     | c
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
d |  34     |         |  345   9||  3     9|         |         ||         |   45   9|         | d
e |1 3      |         |1 3 5   9||  3     9|         |         ||         |         |    5   9| e
f |         |         |   4    9||         |         |         ||         |         |   4    9| f
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
g |  34  7  |         |  34  78 || 2 4  7  |         |         || 234  7  |   4     |         | g
h |   4  7  |         |   4  7  || 2 4  7  |         |         || 2 45 7  |   45   9|         | h
i |         |         |         ||         |         |   4  7  ||  34  7  |         |  34     | i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9       

set a2 = 4.                  4 is unique in cell a2.
set g8 = 4.                  4 is unique in cell g8.
set e1 = 1.                  1 is unique in column 1.
set a1 = 2.                  2 is unique in column 1.
set c2 = 8.                  8 is unique in column 2.
set b4 = 1.                  1 is unique in row b.
set g3 = 8.                  8 is unique in row g.
set h8 = 9.                  9 is unique in row h.
set c3 = 1.                  1 is unique in block 1.
set g3 = 8.                  8 is unique in block 7.
set h8 = 9.                  9 is unique in block 9.