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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.
No,
0
can be a natural number depending on the definition (which, in set theory usage, almost always includes0
).Besides, the description already says
if either negative or decimal return check input
, which0
is not one of them.