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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.
I'm new to the format and don't see an edit suggestion button, so I'll answer in a reply. The language I was speaking of was Go.
These look like valid IPv4 test cases, in which case, there should be tests to see whether more than 4 octects were given e.g.
1.2.3.4.5