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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.
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I'm not sure what you're talking about. Which language?
e.g just console.log(array1, array2) in the function body - in the case of javascript
Print the input.
Using drop_while is not mandatory in this kata, you can do it in some other ways, see Solutions page (your own solution didn't use it). And what you have to do is stated in the description. If it's not clear enough for you, propose a better description.
There is a link to a reference of that function in the kata description, I don't know how could you get lost.