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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.
Зачем убивать мое решение в 40 строк одной строкой :(
Гений
Am I alone who solved it with two Maps? :))
Its took me so long getting understand whats written here