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  Suppose I am a lazy author.  I create a puzzle
    which has a unique solution.

  Instead of creating 200 more, I massage it 200 times
    and then publish a book of 201 puzzles.
  
  How can you massage a puzzle so that
  
    a reader thinks every puzzle is different
    
    you are certain each will still have only one solution

a  139 | .8. | 746        POK Journal 060514  Four Dark Stars                                
b  5.. | .1. | 29.        17:03:28.309 060514                                                
c  .24 | 7.9 | 1.5        Sig  344567999 344567999 556666679                                 
   ----+-----+----        Iteration counts      13  2  0                                     
d  241 | 953 | 867    <-- Blank cell count      25                                           
e  756 | 148 | 329        Nonblank cell count   56                                           
f  983 | 627 | 514          |                                                                
   ----+-----+----          |                                                                
g  ... | 891 | 45.          V                                                                
h  .9. | ... | 6.1  
i  415 | ... | 9..