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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.
Already fixed
if you google the phrase in quotes you should find the text somewhere on wikipedia to verify
you might have missed a space or something like that
you're either not decoding or overdecoding
It means that when I called your implementation of 'contains()', you looked for the item in a branch of the tree that you didn't need to go down.