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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.
this kata kinda lacks information because it doesn't mention about 'there can be numbers before the real number in the last part' and just give basic string + number as example
it can be better if you give at least one example: '1foo009' -> '1foo010'