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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.
It expected the first letter of "have" to be capilalised. "Have" -> "#DoWeHaveAHashtag"
They are not the same, but the message is confusing because the problem is not in the hash character:
Please see this link and this link.