SEO คืออะไรกันแน่ ทำความเข้าใจง่าย ๆ เพื่อ ขึ้นหน้าแรก Google: Revision history
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Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.