README.md in trackler-2.2.1.10

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 57 is not evenly divisible by 10, so this number is not valid.
 ## Source
 
 The Luhn Algorithm on Wikipedia [http://en.wikipedia.org/wiki/Luhn_algorithm](http://en.wikipedia.org/wiki/Luhn_algorithm)
 
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 ## Submitting Incomplete Solutions
 It's possible to submit an incomplete solution so you can see how others have completed the exercise.