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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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Yes, this is very confusing.
Description modified though it was already written:
"... the function nb_year should return n number of entire years needed to get a population greater or equal to p."
For me "surpass" is a synonym of "greater or equal" but I am not a native speaker. Do you have something better to propose?
I note that 117,209 people who passed the kata did'nt see a problem here (though some had problems elsewhere). Can you say with which input you make a mistake?