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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.
As a musician, it's strange to use both flat and sharp in one song. Additionally, you may have to make it clear that why ['Db'] -> -4 steps -> ['A#'], for it should be 'Gb' instead. Btw, it's a great Kata and I'm looking forward to see more music-relative practices here.
D translation
PHP translation kumited! Plase Accept :D
In C# unit test code you could omit the [Test] attribute when using [TestCase] attributes.