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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.
+1, on python as well
It's ambigusous if it's second to last in the current string (ie l[-2] or 2nd biggest value (sorted(l)[-2]).
On top of that, behaviour is unclear for empty/singleton lists.
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