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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.
That's spoiling part of the solution. Please don't... One needs to think, try, fail, try again, to solve a kata (and learn), not read the Discourse page.
This comment is hidden because it contains spoiler information about the solution
They shouldn't be all valid, that's a list of words, it can contain invalid ones and you can't use them. See the 5th example.