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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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The number of completions
74
out of15,733
that you are seeing is:your_language
out ofall_completions_in_all_available_languages
So for example there are
4741
completions in Python as I just looked now, whereas there are only74+1
brave Dart enjoyers ;)The second element of your output is an empty string. The tests try to parse it to double, but they fail.
Not a kata suggestion (= suggestion of improvement of the kata). Also, you must not post hints on Discourse page; users are expected to solve the katas by themselves.
You'll need to be more specific.
What does this mean? Are you returning 2? You just explained in the sentence before that it takes 4 steps to get to single-digit number, that's the answer (not the remaining number).