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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 made it clearer now I believe. I also included an image.
If this is no longer an issue could you mark as solved please? Thank you.
This comment is hidden because it contains spoiler information about the solution
I have never used Java before (I wrote the JavaScript version of the code), but might it have something to do with the fact that isTriangleNumberDP is using an int in the for loop instead of a Long?