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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.
add test case
you are of genius
"def getNumber(number)" should be switched to "def getNumber(number):".
Also, naming may follow PEP e.g.) get_number. However, it is just an option I would say.
Not a clear definition of "invalid sequence"