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.
This problem shouldn't have been in the fundamental category, although it is beginner level.
Did you add all necessary imports to your code?
why is my solution failing to pass because of Lists and ArrayList keywords, are they not allowed ?