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Just to clarify a little about the output format I am currently trying:
If the list is already sorted, it will print a single blank line.
It also prints a blank line after the end of the last test case (although I have tried it without this)
There is, of course, a blank line separating each test ...

I too am having troubles getting this problem accepted. My program seems to work for any input I can concieve of. It prints a blank line only between test cases, though I have also tried making it print a blank line at the end of any test case even if it is not followed by another case. I am using ...