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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.
sort_by uses an unstable quicksort so any chars being sorted by the size of the ordering string are not quaranteed to retain their position among other unsorted chars.
Yes, you are correct. But why the heck does it do that?