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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.
There is no comment on what to do in case of 1-element list.
It is not obvious, because there are no 2 elements to be summed up.
The second pop is redundant. We only need the min value in numbers, we don't need to pop it.