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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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I met this issue as well. More interestingly, if you calculate the difference between your answer and the correct (presumably?) answer, they always differ by a number that has a high power in 2 when prime factorized, like 1736704 (2^15 * 53) or 16384 in the case of IMMUNOELECTROPHORETICALLY, which is 2^14.