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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.
This is perhaps the first such integer: 1125899940397056. For this input, the answer should be 1125899906842624, but it gives 1125899973951489.
And the total number of such safe integers is tens of millions.