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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 description says: "Return the height as multiple of the ball diameter." So the exact value of diameter is not needed, you just need to tell how many ball heights is the whole pyramid.
If it helps anything, you can assume the diameter to be always 1.
No, they're spheres, not cubes.
list = [*string] is the same as list = list(string)