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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.
Should add a test test.assert_equals(find_nb(1), 1). My solution would fail, but it passed all tests and from the description it should be possible. Also a test for find_nb(0), -1 should be there because a building without a volume can not exists