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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Exactly.
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Add this line to the sample tests
$this->revTest(nbDig(25, 1), 11);
and figure out what is wrong with it.There is no invalid input afaik, so your code should be fine without doing any input validation.
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