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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.
The negation there is to remove the multiples of 15 since they are accomulated twice,
once with the 3 accomulator and the other with the 5 accomulator.
I honestly don't remember, I'll have a good look at it soon, see if i can crack my old code. This is why you should write good comments on everything you write!