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Developer's duplicate-content gate missed a page and wrongly blocked another

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A developer running a site of free calculators built a pre-publication script to stop new pages from competing with existing ones for the same search queries. On its first real use, the gate made two errors in opposite directions. It wrongly blocked a Quebec paycheck calculator because generic existing pages' word sets were treated as covering a more specific keyword, and it failed to catch a planned BC income tax calculator that an existing page already targeted in its body text. The developer fixed the first by allowing the coverage test in one direction only, and the second by having the gate also scan the built page text for phrase matches. The updated check flagged two existing pages, leading the developer to drop the planned pages and retitle the existing ones around the phrase searchers actually use.

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