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If you have read this help page and find something missing or confusing, please discuss it at the main talk page. Please reference this page and the page where you have the problem so we can understand your issues. For basic information on the footnotes system, see Referencing for beginners; for advanced help, see Footnotes.
This help page is a how-to guide. It explains concepts or processes used by the Wikipedia community. It is not one of Wikipedia's policies or guidelines , and may reflect varying levels of consensus .
Pages are placed in this category when any of the following cite errors are generated on the page: There are <ref group=$1> tags on this page, but the references will not show without a {{reflist|group=$1}} template (see the help page). See the linked help pages for causes and solutions. See Help:Cite errors for information on other footnote ...
chapter number or page numbers for the chapter (optional) In some instances, the verso of a book's title page may record, "Reprinted with corrections XXXX" or similar, where "XXXX" is a year. This is a different version of a book in the same way that different editions are different versions.
This page is an attempt to locate all such instances of this problem and fix them. A script was run on an offline copy of the database. First, it isolated all pages with duplicate headers. Then, it sliced each remaining page into three-word "chains" or "triplets" and looked to see how many of these chains appeared more than once.
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For example, a three-page work (starting on the left-hand sheet) followed immediately by a two-page work involves one page turn during each work. If a blank page immediately follows the three-page work (on the right-hand sheet), the two-page work will span the left and right pages, alleviating the need for a page turn during the second work.
It leaves one page unchanged, and re-maps each duplicate page to point to the same physical page, after which it releases the extra physical pages for re-use. It also marks both virtual pages as " copy-on-write " (COW), so that kernel will automatically remap a virtual page back to having its own separate physical page as soon as any process ...