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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.
Yes, the description says to create passwords with 6-20 chars. You are creating passwords with 8-20 chars.
I believe this means that you're having too restrictive of a length of passwords - should be between 6 and 20, yours look like they are between 8 and 20.