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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.
I wrote at the end before return expression this prompt
else: return zipcode+':/'
, but there's still an error':' should equal ':/'
.What did go wrong?
could anyone explain what makes 2*(n-1) option better than n*2-2?