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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.
I think the total word in the sentence "subtract the total of the string integers." is a bit confusing, rather it should be sum. I felt total some what refers to count.
"Given a mixed array of number and string representations of integers, add up the non-string integers and subtract the sum of the string integers."