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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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Feel free to design an advanced spinoff of this puzzle though where this may be important.
Citing the kata description:
aug is an integer, percent a positive or null floating number, p0 and p are positive integers (> 0)
Why catch errors when they are not expected by definition?
What if aug (inhabitants coming or LEAVING each year) is negative and bigger than % increase? It's a really efficient code but cound do with an error catcher, maybe?