Loading collection data...
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.
I didn't really get this at first either. The way I'd describe it is: "Remove every second character from the initial string and append these removed characters to the end of the string. Do this n times", although I'm not sure if that's clearer.