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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.
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Sorry, but I just didn't get an explanation to that.
We find a large diagonal of a right triangle, according to the Pythagorean theorem. In 1 test I got the answer 3.74, but in the author the answer was 4.24. Why?