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  • $\begingroup$ I don't think this is well specified. For example, what if by turning some subset of the "x" you get the warning but with some others not, how do you decide which changes you want? $\endgroup$ Commented Mar 2, 2013 at 16:07
  • $\begingroup$ Or you want "find the x in whatever order and one by one try changing them and checking if the result is valid"? $\endgroup$ Commented Mar 2, 2013 at 16:07
  • $\begingroup$ @Rojo One instance will be sufficient but if it will return every possible valid result that would be awesome. $\endgroup$ Commented Mar 2, 2013 at 16:11