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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.
anter69, could you explain the flow. What does the kata actually want me to do??
EDIT: Nevermind got it.
The hidden test cases are by definition hidden. Disclose them would facilitate cheating! But you could simply print the input...
"Ain't that cute? ...but it's wroooong!"
correct solution:
http://imgur.com/11P5Lax
What about if there are more than 3 of a number?
Sorry - I'd love to help but I didn't write the Ruby translation. Maybe ask GiacomoSorbi?