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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.
It did say max input won't exceed 359999 it does not say the function shouldn't be able to handle larger numbers
HH = hours, padded to 2 digits, range: 00 - 99
range = you should respect ^^
That's a given, not something you should enforce.