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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.
For 2 million characters, the difference will be as follows
Time taken by regex function: 12066 ms
Time taken by set function: 2837 ms
Time taken by erase function: 123 ms