What happens if there's a string within the list? How should that be handled, or is the possibility not being taken into account here? Your description isn't totally clear on that. You're accounting for strings on their own but not within the list as is.

That was exactly it, thank you very much!

Like I said, I tested "ya" and it returns "ayay", thus my confusion. I checked specifically for "ya" as well to see if it was the issue and it didn't work, so I'm guessing "ya" is not the test case. I can't figure out what's going on.

I got this error: "'yaay' should equal 'ayay'" in python and I'm not sure what's going on. I tested "ya" and it returns 'ayay' so I'm confused.

I've finished it now and changed it so an empty string would be returned instead of None. I'm referring to the last test case (python)- an empty string that passed and it expects an empty string to be returned, not 'Not a string'.

I just got "Output not as expected: None should equal ''" as an error (test 10). I'm assuming it was given an empty string, shouldn't None be an acceptable answer as well as an empty string in this case?

Well, if anything I now know a whole pile about estimating the zeros in factorials. I also know about half a dozen ways to make this kata time out.

You have a typo in the instructions- "cellophane keypad".

The description doesn't really match what's actually being asked (one argument instead of two) and it's impossible to figure out which argument is what without trial and error.

Yes, this would have saved me a lot of time. All the rest are >=, F is the only one thats just >.