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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.
Oops my bad. I changed the description
Hello, zLuki,
but the explanation says "max length of 12". I'm confused.
Hi,
"short.ly/abcd" isn't wrong and it will work.
I tried your code, you are returning URLs which are longer than 13 for example "short.ly/abcde" and that is an incorrect format :)
Good luck!