might be interested:
http://butunclebob.com/ArticleS.UncleBob.TheBowlingGameKata

my advice to others is to do not try to decode until you find the clue1 text

many thanks for the explanation! wasted 3 hours decoding letters and reading java abd javascript String class docs since python does not have String class. disappointed by this kata(

what do two exclamation marks do?

interesting way to avoid inner loop or recursion:
list = list.SelectMany

Hi FrankK!
I really enjoyed the kata and learned how to simplify my code after seeing best practice solution. Thank you very much!
I'd also add a test that asserts that name passing to constructors can't be null or empty.
And, as already mentioned, it would be great to add tests to check whether result singleton is thread-safe. Not sure if it is possible, however)...

that were dark times without linq