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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.
The answer in the test is 12. But the 3rd figure has an area of 6, in total all the figures are 10. Dear developers, please count with your finger in the drawing and correct the test or conditions.