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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.
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Nice regexp parse :)
But it seems not good idea to use coded argument names, better to generate them ('A' ... 'Z')
except cases where we have 66 arguments :)
In the description it says return nothing, but you returned 0, so...
It is bad practice when you swap arguments' order, when some of them are defaults. This kata is good just for one purpose: to learn that you shouldn't make such strategy in code :).