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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.
^^ what johnny said
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One of your problems is that
replacedoesn't work as you think, you should read its documentation first.And you should use the markdown syntax to format your code and make it readable (three backticks
`before and after your code will be a good start).