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} endif; if ( ! function_exists( 'twentythirteen_post_nav' ) ) : /** * Display navigation to next/previous post when applicable. * * @since Twenty Thirteen 1.0 * * @return void */ function twentythirteen_post_nav() { global $post; // Don't print empty markup if there's nowhere to navigate. $previous = ( is_attachment() ) ? get_post( $post->post_parent ) : get_adjacent_post( false, '', true ); $next = get_adjacent_post( false, '', false ); if ( ! $next && ! $previous ) return; ?>