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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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Minor rewrite:
In your class, you have started lessons about arithmetic progression.
Since you are also a programmer, you have decided to write a function that will print the first 'n' elements of the sequence with the given common difference 'r' and first element 'a'.
Result should be separated by comma and space.
Example:
arithmetic_sequence_elements(1, 2, 5) == '1, 3, 5, 7, 9'
More info: https://en.wikipedia.org/wiki/Arithmetic_progression
Took me a bit to understand what the kata actually wanted me to do. May want to rephrase it a bit. Anyway kata wasn't bad at all, this is just my opinion.