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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 just wanted to say, in the instructions you said "009C:0000:120A can be written as 9C::120A", that's wrong as seen in this RFC : https://datatracker.ietf.org/doc/html/rfc5952#section-4.2.2
You cannot shorten an IPv6 address with only a single zero hextet.