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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.
I like this method of just declaring basic characters and its numbers. This really so called elegant.
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I like the method for checking decrement and increment numbers though it's not universal. I believe putting the conditions which is more likely to be true can improve the time efficiency.
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A good method to transform a list of string to that of number
LOL
a method to rotate 2D list based on zip