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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.
In the class WebDeveloper: instead of the 'extra line of code' you mentioned in the lesson description I changed 'parent' to the name of the first parent, or GrandParent (Person).
It may be nice to mention this method in the desceiption because it keeps the (just a little) shorter and workes just as well.