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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.
You miss that if x has no orthogal acsess to water or higher then sea level - no water spread. Also you can look at examples in description and submarine test cases