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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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This doesn't work for odd numbers:
You may need to learn more about number systems (bases or radix) and/or maths in general. The underlying concept is not elementary mathematics, even though the coding part is very basic.
you may start here: https://www.mathsisfun.com/numbers/bases.html
@anter69, that didn't help at all. Can you tell me how they get 21 from 39 using this "base 16" (according to wikipedia base 16 is 42, numbers from 0-9 + letters in alphabet). 42-39 is 3, multiplying will only make it go higher so really, hot to get 21 with 39 and 42?
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