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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.
Great problem, only a minor thing; the depreciation structure explanation could maybe be a little clearer. At first glance it could be a little confusing and it may seem like on the third year on onward you are asking for an additional 10% depreciation rate increase eache year (like 30% depreciation on the third year %40 on the 4th year and so on)