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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.
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"If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in."
I passed the test but when clicking on attempt, I get an error saying expected:<78> but was: <23> so when changing the value of x to 20, I then get an error saying expected:<23> but was: <78>. I'm now confused.