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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 array does not record months' length in the right order, for example, August (8) has 31 days, not 30
1604 is a leap year ;-)
what "last test" ? random test or sample test ? what language are you using ?