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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.
It may be a valid IP address, but it's out of the scope of this kata.
Description updated.
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Yes, leading zeros should be valid. Try pinging 127.000.000.001.