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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.
If you don't add isinstance(i,bool) it will ignore False(type bool) list and you will get an extra zero at the end. For example give [False,1,2,0,3,0,3] as an input and see the output .