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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.
i am not sure of the other solutions, but checking if the granny has any friend or only 1 friend is mandatory!
A great programmer checks for pitfalls, even if they are not covered by tests!
'+ types for input variables
'+ type for return value