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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.
then why yourself didn't specify ?
Nah. The default value for the base (10) works absolutely perfectly here, so not necessary to specify the base.
Nested loop
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A negative number indicates to remove 'x' amount of characters from the end of the string as opposed to the front.