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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.
Yes, it's a reason for it... but i haven't recognized that it got invalid and valid again;-). Next time next kata without list;-)...
some [108], [500] appear in your test array, lets me feel helpless ;-)
No, did no change... And sorry, can't help here at the moment, because i can't test here this details - so i don't want to give wrong hints. Perhaps someone else gives a short hint...?
Perhaps it's global outside the function? Don't know what you are doing... But i've implemented a factorization function before this solution (did it some katas ago) - which i deleted later on. So sometimes such solutions appear;-)...
Yes, really magic;-)!