Template:MaybePrev

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If subtracting 1 from the last part (after a '/') of this page's title creates a page title which exists, link to that with a small left arrow. This is used in infobox headers of annual events such as Bilderberg meetings or groups such as Rhodes Scholar/1989, to link to the page for the previous year, if it exists.
Usage:
{{MaybePrev}}