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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.
just for arguments sake, i wouldnt make human an interface since men and women share attributes, not just behaviors
it may be a bit redundant to make the Human class abstract here, since there are no methods or attributes inherrited by man or woman, so theres no common behavior to impliment