Oops. Sorry about that. I am working this Kata in Java.

Help requested. My solution seems to be choking primative primitive int limitations, as evidenced by the following:
30 choose 11 equals 54627300; m equals 155117520
30 choose 12 equals 86493225; m equals 155117520
30 choose 13 equals 119759850; m equals 155117520
30 choose 14 equals -66175233; m equals 155117520
That said, I've tried very hard to make my program always use a primitive long type at all stages. I could convert to BigInteger, and that would likely solve the problem, but I am trying to learn about long vs. int and what I am doing wrong. (Should I paste my code here?)

okay. I was way off in my interpretation of the requirements, as it turns out, and the hyphen was just the "character" to point that out. thanks.

I have a question about testInvalid4(IdentifierCheckerTest)
The string being passed in appears to be "str-str"
The expected result is Invalid
Per my reading of the requirements, I would expect the expected result to be Valid
-> each item in the string "s" "t" "r" "-" appears to be valid, at least based on my understanding
So, why is the expected result Invalid?