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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.
I have stumbled upon this bug too. An alias of 'f' did not compile. When I changed it to 'p' I had no problems with aliases.
EDIT: After looking at solutions I am sure the problem is something else. Everyone uses 'f' without issues. I have already forgotten what code had the bug.
I notice that this kata has an issue with aliases. I know they aren't technically needed except for joins but I didn't expect errors to be thrown from using them.