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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.
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Perl tests seem too permissive, passing for a non rounded float result:
Calculating the area was the "easy" part, compared to covering all the invalid path scenarios, especially properly handling the mousehole.