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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.
Hello there. In the last kata (Mobius function) I accidentally submitted my solution without giving a reference to the factors function I've used. This function comes from Chris Cogdon in the thread: http://stackoverflow.com/questions/16996217/prime-factorization-list
Sorry for not being thorough enough.