simpded3

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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.

a  24. | 563 | 981        Sinden 171                                                         
b  9.6 | 18. | .7.        10:08:37.971 060508                                                
c  581 | .9. | .6.        Sig  555666677 444466889 555566678                                 
   ----+-----+----        Iteration counts       4  0  0                                     
d  .6. | .21 | 8.7    <-- Blank cell count      28                                           
e  17. | .48 | 62.        Nonblank cell count   66                                           
f  82. | 675 | 13.          |                                                                
   ----+-----+----          |                                                                
g  .58 | .19 | .46          V                                                                
h  .1. | .36 | .98  
i  692 | 85. | .1.