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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.
You certainly know how to code in base 16. In base 16 we can't limit ourselves to digit from 0 to 9, we extend the "alphabet" with A to F.
You could have a look at "Numeral System" in Wikipedia:
http://en.wikipedia.org/wiki/Numeral_system
http://en.wikipedia.org/wiki/Factorial_number_system
Maybe I must had these references to the kata.
Can you propose a better description?
Still doing it to me. Edit: reloaded page and it worked
(issue resolved)
It's problem with test framework, I sometimes have this problem with different kata randomly (server overload maybe)