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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.
I did this in C and had the same issue. Turned out my math was coming out wrong but it still passed the inital tests. Use printf to check your results againt wolfram and see what happens.