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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.
You changed the parameter from const reference?
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I saw another comment on this thread regarding this, however I would like to reiterate it. In C++, the (<=30) test will fail if the test case is not cast, or stored, as a float. This is due to the decimal precision between doubles and floats in C++.