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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.
The overall idea is quite interesting and unique.
I have to admit, though, that the requirement of an exception as a possible output
seems to me unjust and unnecessary, especially in context of a FP oriented language.
peace
Very nice, great success
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WoW