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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.
Your code fails to address this -->
There are no fractions of people. At the end of each year, the population count is an integer: 252.8 people round down to 252 persons.Your code not working is not an issue. An issue is a bug in the kata.
Your code is too slow. There are faster ways of solving this.