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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.
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6 is the 6th smallest hamming number, not the 7th.
While computing the n-th smallest hamming number, exactly on the line hamming(7), the IDE outputs 6 which is the right answer in my code, while in the example it's shown as 8 which is bigger than 6, so we can be sure that it is not correct, 6 is computed 2^13^15^0.
GOOD JOB!