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Code Duplication    Length = 4-4 lines in 3 locations

src/wp-includes/canonical.php 3 locations

@@ 166-169 (lines=4) @@
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			} else {
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				$redirect_url = get_attachment_link();
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			}
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		} elseif ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
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			if ( $redirect_url = get_permalink(get_query_var('p')) )
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				$redirect['query'] = remove_query_arg(array('p', 'post_type'), $redirect['query']);
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		} elseif ( is_single() && !empty($_GET['name'])  && ! $redirect_url ) {
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			if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) )
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				$redirect['query'] = remove_query_arg('name', $redirect['query']);
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		} elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
@@ 172-175 (lines=4) @@
169 
		} elseif ( is_single() && !empty($_GET['name'])  && ! $redirect_url ) {
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			if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) )
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				$redirect['query'] = remove_query_arg('name', $redirect['query']);
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		} elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
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			if ( $redirect_url = get_permalink(get_query_var('page_id')) )
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				$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
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		} elseif ( is_page() && !is_feed() && 'page' == get_option('show_on_front') && get_queried_object_id() == get_option('page_on_front')  && ! $redirect_url ) {
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			$redirect_url = home_url('/');
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		} elseif ( is_home() && !empty($_GET['page_id']) && 'page' == get_option('show_on_front') && get_query_var('page_id') == get_option('page_for_posts')  && ! $redirect_url ) {
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			if ( $redirect_url = get_permalink(get_option('page_for_posts')) )
@@ 202-205 (lines=4) @@
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		} elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
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			if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
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				$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
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		} elseif ( is_year() && !empty($_GET['year']) ) {
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			if ( $redirect_url = get_year_link(get_query_var('year')) )
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				$redirect['query'] = remove_query_arg('year', $redirect['query']);
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		} elseif ( is_author() && !empty($_GET['author']) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) {
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			$author = get_userdata(get_query_var('author'));
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			if ( ( false !== $author ) && $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE $wpdb->posts.post_author = %d AND $wpdb->posts.post_status = 'publish' LIMIT 1", $author->ID ) ) ) {
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				if ( $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )