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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.
If you're not going to use the original later, you can change it. Maybe in a realife project, it is best to stay safe by making a copy.
Yes.
Second argument is an empty string in order to remove all characters that fall with the regex (a-m) which leaves a string with only error chars which is what the question wanted
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