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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 is still poorly written despite the number of people who passed. It just means they read other comments or did more research to understand this problem further. The problem here lies in the interpretation itself rather than in the actual problem solving.
Before posting an issue you should look at the top of the page to see how many people passed the kata in your language (995 with PHP). If this number is big enough (and it is!) chances are your code is wrong or you didn't understand the description.
A good source of info when you fail is to read comments of other people.
Since you are new at CW you should read https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution.