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Subjects
0 subjects that its 1 rival write about, 0 covered by a page of its own.
No rival read near it writes about a subject close to its own yet.
A gap is a subject rivals write about that nothing on the site comes close to; a page covers a subject when it reads 60% or closer to a rival's page on it. Close means similar in meaning, not that a page ranks, is better, or is cited. A rival kept unnamed by its owner is counted, never named.