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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.
your code is wrong : the
lenghtproperty ondigitsdoesn't exist, so the first condition is useless... and if you had correcctly spelled thelengthproperty, your solution wouldn't have passed.