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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.
catch is a keyword used to handle exceptions and check if the user is using the program wrongly. For more info. you can read the documentation.
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I think that syntax for java am doing this semester and I have seen the same syntax and maybe you were using c# I guess. So please specify which language you were using coz for me also I was using Java and the test went through correctly