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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.
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Surprisingly easy for 7 kyu
This question needs some rephrasing and clarification. If how I understood it is correct, then nth floor should be meters, because the height of each floor is unknown