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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.
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It's how percent decrease works. Increase in 0.82 times is equal to decrease in 0.18 times.
Assuming this solution does not count yourPoints in average (which was specially mentioned in a task) but still counts as "valid" solution, testing samples are lame.