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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.
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来自神秘东方的magic number
and your nim-sum is exactly xor. congratulations for re-create such an important operator, which also happened on me at the first time.