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In Series provides a way for you to manage stringing together posts in a series. You can add and remove individual posts from series, and reorder posts within a series, all from the post writing screen. The plugin also allows you to customize how series information (like tables of contents and next/previous links) are rendered across your site. Best of all, In Series does not require any template hacking, or knowledge of PHP -- it will work just fine right out of the box.