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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 absolutely is an increasing sequence. The kata defined 0 as coming after 9 for increasing sequences. The 1 in the end can be safely ignored because a number was defined to have at least three characters
It is not an increasing sequence.
What about 8901?