These are code-signs for three possible modes. "n/f" means this link was not found on the page, "n/a" means this site is unavailable now, and "n/t" — that this link exists on a page but has no text (e.g., this is a picture as a link). You can also use Help to see the meaning of this codes in the program's work.
And also check Alexa Rank, Google PR.
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