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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.
OP solved it, closing
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The last number is 99, so increment 99 by 1, which is 100.
You can solve it using any of those.
What you should probably be doing though is to think about how you would solve it yourself as a human being. Then write your program to do the same actions.