in reply to Re: interpretation of "neither...nor"
Since you already got the answer to your question, the only thing I could add is a recommendation to have a careful look at the article on Truth Tables in the Wikipedia.
Thank you for the Wikipedia link. It was quite helpful!
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
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