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Feb 16, 2017 at 16:03 comment added Wouter Doeland Wow! That is really smart.
Feb 16, 2017 at 13:44 comment added Ilmari Karonen No problem. BTW, even if the difference had been non-invertible, all might still not have been lost; I added a note about how to handle that case to my answer.
Feb 16, 2017 at 13:43 history edited Ilmari Karonen CC BY-SA 3.0
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Feb 16, 2017 at 13:36 vote accept Wouter Doeland
Feb 16, 2017 at 13:30 history answered Ilmari Karonen CC BY-SA 3.0