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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.
"because the random tests are broken..."
Moreover, if we change one dimension of the Block with a simple setter, the Surface Area and Volume become wrong.
How did you fix it?
Same issue, in Ruby. The kata is impossible to finish with these errors on testing.