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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 have to use split(" ") note the space between the speech marks, this indicates what you want to use for your split
string.split(separator)
That depends strongly on the language you're using. One way is to use regular expressions (you need to search for your language documentation about it), but there are multiple approaches possible.