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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 should remember that when adding in decimal and adding in binary, you get the same number. (For example 3(10) = 11(2))
And for people who write in JS, the toString method will also help.