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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.
This is an issue with this kata.
It doesn't support anonymous functions. Try and use the
function cleanString () {}notation instead....find the sum of all the numbers between...
should be
...find the sum of all the integers between...