I'm pretty sure that you can have multiple listings for either column also, so the filter looks for either no failures or no passes when considering whether or not the test was failed as a whole (Scott, please correct me if I'm wrong).
No. Each line is treated separately
If you have a line "example.com example.net", that says that if the return address contains "example.com", then the reverse DNS entry must contain "example.com" or "example.net". If you have a second line "example.com example.us", it says that if the return address contains "example.com", then the reverse DNS entry must contain "example.com" or "example.us".
With both those lines, an E-mail with a reverse DNS entry that does not contain "example.com" would fail at least one of those two lines, causing the test to fail.
-Scott
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