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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.
Good, you passed but maybe your condition for "Impossible to decode" could be clearer?:-)
Unfortunately there is nothing to update. 105860 is not a valid number for decoding. You could read comments below and try to understand why.
Your process of identifying invalid numvers is incorrect; sorry.