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A hyperlink should not end in an ampersand character (&) for a page that doesn't have a query string parameter.
Explanation
If one hyperlink ends in an ampersand character (&), even if it is otherwise identical to other hyperlinks that point to the same page, it will be analyzed by the search engine as pointing to a different page.
Details
The following hyperlink examples link to the same page, but would be analyzed by a search engine as pointing to two separate pages:
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