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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.
Agree. Also tests for .co.uk extension types.
The tests for subdomains should be included and should expect results for things like 'gmail.google.com' and 'a.b.c.gmail.google.com'.
Also agree with earlier comments that the expected solutions should include the TLD, so google.com in both cases not google.