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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.
The base is two but it doesn't matter, even if it's e, as long as it's the same number for numerator and denominator
Math.log() is a natural logarithm which means the base is 'e' and not 2.
The 'U' can be found twice in the RegEx.