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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.
And how are you adding all the numbers between
a
andb
like that? See the last example, your code returns1
. The tests are ok, it's your code what's wrong.