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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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In the description the star increases by two hence every floor will have an odd number of stars.
Just confused about the 'inconsistent' part...
No such issue have been reported so far so How about you read the description again and try one more time?
That's one of the main problems I had with this Kata. But as you said, it's not bad if you're exercising your programming skill (as I am).
I have the same issue with another kata. I get this error message: "Submission timed out. Please try again.". I have tried to submit for over 30 minutes.
Maybe there's a problem with the code runner or the submission system.