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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.
Many people write:
FYI, There is no trickery to this Kata. It is just a matter of visualising the balls in a certain way -- think about equalateral triangles. When/if you understand what to do, the maths is very easy -- that is why it is only 7kyu.
nil or null or None is not the same as empty.