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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've also solved it but it's not accepting my answer. Text compare says my solution and the expected solution are the same. Any ideas? Using Python.
could also use tree.constructor === Object
the 'typeof' output for [] is 'object' in ES6 which seems to make things hard...