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[xs_cat_9]

Linkxs_cat_9
AuthorJonathan Guthrie
CategoryCustom Tag
Version9.x
LicensePublic Domain
Posted26 Sep 2012
Updated26 Sep 2012
More by this author...

Description

Lasso 8.x version can be found at http://www.lassosoft.com/tagswap/detail/xs_cat

Usage is the same as previous versions:

 

 

Sample Usage

Member tags:
----------------------------------------------------------------------------------------

addSibling
Adds an entry AFTER specified item, at the same depth

addChild
Adds a child to the specified item.
Usually employed when there is no existing child.

deleteNode
Self-descriptive... DELETES the node and all it's child nodes.

moveNode
Self-descriptive... MOVES the node and all it's child nodes in the specified direction.

fullCatSQL
Returns the SQL required to extract the full tree.

subTreeSQL
Returns the SQL required to extract the tree branching from a specified node.

showPathSQL
Returns the SQL that will extract the linear path from the root to the node.

getParent
Returns a map with the parent id and name

Database
----------------------------------------------------------------------------------------

CREATE TABLE `nestedset` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(64) collate utf8_bin NOT NULL default '',
`lft` int(11) NOT NULL default '0',
`rgt` int(11) NOT NULL default '0',
`status` int(2) NOT NULL default '1',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin

Usage
----------------------------------------------------------------------------------------
xs_cat->(addSibling(-cattable='category',-txt='Hello World',-id=10))
xs_cat->(addChild(-cattable='category',-txt='Hello World',-id=10))
xs_cat->(deleteNode(-cattable='category',-id=10))
xs_cat->(moveNode(-cattable='category',-id=10))
xs_cat->(fullCatSQL(-cattable='category',-xtraReturn=',column1, column2',-xtraWhere='SQL statement here'))
xs_cat->(subTreeSQL(-cattable='category',-depth=2,-relative=true,-xtraReturn=',column1, column2',-xtraWhere='SQL statement here'))
xs_cat->(showPathSQL(-cattable='category',-id=3,-xtraReturn=',column1, column2',-xtraWhere='SQL statement here',-fieldname='name'))

Source Code

Click the "Download" button below to retrieve a copy of this tag, including the complete documentation and sample usage shown on this page. Place the downloaded ".inc" file in your LassoStartup folder, restart Lasso, and you can begin using this tag immediately.

	// -----------------------------------------------------------
	/*	
		
		VERSION 2010-04-09
		
		NOTE: 
	
		-	MUST be used ONLY with MySQL 4.1+ as it requires subqueries
		-	$gv_sql must be defined appropriately
		-	-cattable will be required to be passed in all operations
		
		DESCRIPTION
			addSibling
				Adds an entry AFTER specified item, at the same depth
			addChild
				Adds a child to the specified item.
				Usually employed when there is no existing child.
			addRoot
				Adds a node at the root - at the end
			deleteNode
				Self-descriptive... DELETES the node and all it's child nodes.
			moveNode
				Self-descriptive... MOVES the node and all it's child nodes in the specified direction.
			moveNodeTo
				Moves given node + nested nodes to inside a given node's id.
			fullCatSQL
				Returns the SQL required to extract the full tree.
			subTreeSQL
				Returns the SQL required to extract the tree branching from a specified node.
			showPathSQL
				Returns the SQL that will extract the linear path from the root to the node.
			getParent
				Returns a map, id and parentname
			getURLpath
				Returns the url page like /hello/world/ from an id
		
		USAGE:
		xs_cat->(addSibling(-cattable='category',-txt='Hello World',-id=10));
		xs_cat->(addChild(-cattable='category',-txt='Hello World',-id=10));
		xs_cat->(deleteNode(-cattable='category',-id=10));
		xs_cat->(moveNode(-cattable='category',-id=10));
		xs_cat->(fullCatSQL(-cattable='category',-xtraReturn=',column1, column2',-xtraWhere='SQL statement here'));
		xs_cat->(subTreeSQL(-cattable='category',-depth=2,-relative=true,-xtraReturn=',column1, column2',-xtraWhere='SQL statement here'));
		xs_cat->(showPathSQL(-cattable='category',-xtraReturn=',column1, column2',-xtraWhere='SQL statement here'));
	
		CHANGES:
		2006-06-17
			Added order to fullcatSQL
			
		2010-04-09
			Converted to Lasso 9
	*/
	// -----------------------------------------------------------

	define xs_cat => type {

		public addSibling(-cattable::string,-txt::string,-othersmap::map=map,-id::integer,-fieldname::string='name') => {
			// ADDS ENTRY AFTER ANOTHER CHILD, SAME LEVEL
			
			local(
				xtraFields = string, 
				xtraValues = string,
				uniqueSeed = lasso_uniqueid
				)
			if(#othersmap->size > 0) => {
				iterate(#othersmap,local(temp)) => {
					#xtraFields += ','+#temp->name
					#temp->value == 'NOW()' ? #xtraValues += ',NOW()' | #xtraValues += ',"'+#temp->value+'"'
				}
			}
			local(sSQL = '
				LOCK TABLE '+#cattable+' WRITE;
				
				SELECT @myRight := rgt FROM '+#cattable+' WHERE id = '+#id+';
				
				UPDATE '+#cattable+' SET rgt = rgt + 2 WHERE rgt > @myRight;
				UPDATE '+#cattable+' SET lft = lft + 2 WHERE lft > @myRight;
				
				INSERT INTO '+#cattable+'('+#fieldname+', lft, rgt'+#xtraFields+',uniqueSeed) VALUES("'+(encode_sql(#txt))+'", @myRight + 1, @myRight + 2'+#xtraValues+',"'+#uniqueSeed+'");
				
				UNLOCK TABLES;
			');
			inline($gv_sql,-SQL=#sSQL) => {
				xs_iserror
				inline($gv_sql,-SQL='SELECT id FROM '+#cattable+' WHERE uniqueSeed = "'+#uniqueSeed+'" LIMIT 1') => {
					records => {
						return field('id')
					}
				}
			}
		}


		public addChild(-cattable::string,-txt::string,-othersmap::map=map,-id::integer,-fieldname::string='name',-atend::boolean='false') => {
			// ADDS ENTRY NESTED INSIDE CAT WHERE NO CHILD EXISTS
			local(
				xtraFields = string, 
				xtraValues = string,
				uniqueSeed = lasso_uniqueid
				)
			if(#othersmap->size > 0) => {
				iterate(#othersmap,local(temp)) => {
					#xtraFields += ','+#temp->name
					#temp->value == 'NOW()' ? #xtraValues += ',NOW()' | #xtraValues += ',"'+#temp->value+'"'
				}
			}
			if(#atend == false) => {
				local(sSQL = '
					LOCK TABLE '+#cattable+' WRITE;
					
					SELECT @myLeft := lft FROM '+#cattable+' WHERE id = '+#id+';
					
					UPDATE '+#cattable+' SET rgt = rgt + 2 WHERE rgt > @myLeft;
					UPDATE '+#cattable+' SET lft = lft + 2 WHERE lft > @myLeft;
					
					INSERT INTO '+#cattable+'('+#fieldname+', lft, rgt'+#xtraFields+',uniqueSeed) VALUES("'+(encode_sql(#txt))+'", @myLeft + 1, @myLeft + 2'+#xtraValues+',"'+#uniqueSeed+'");
					
					UNLOCK TABLES;
				')
			else
				local(sSQL = '
					LOCK TABLE '+#cattable+' WRITE;
					
					SELECT @myRight := rgt FROM '+#cattable+' WHERE id = '+#id+';
					
					UPDATE '+#cattable+' SET rgt = rgt + 2 WHERE rgt >= @myRight;
					UPDATE '+#cattable+' SET lft = lft + 2 WHERE lft >= @myRight;
					
					INSERT INTO '+#cattable+'('+#fieldname+', lft, rgt'+#xtraFields+',uniqueSeed) VALUES("'+(encode_sql(#txt))+'", @myRight, @myRight + 1'+#xtraValues+',"'+#uniqueSeed+'");
					
					UNLOCK TABLES;
				')
			}
			
			inline($gv_sql,-SQL=#sSQL) => {
				xs_iserror
				inline($gv_sql,-SQL='SELECT id FROM '+#cattable+' WHERE uniqueSeed = "'+#uniqueSeed+'" LIMIT 1') => {
					records => {
						return field('id')
					}
				}
			}
		}


		public addRoot(-cattable::string,-txt::string,-othersmap::map=map,-fieldname::string='name') => {
			// ADDS ROOT NODE AT END
			local(
				xtraFields = string, 
				xtraValues = string,
				uniqueSeed = lasso_uniqueid
				)
			if(#othersmap->size > 0) => {
				iterate(#othersmap,local(temp)) => {
					#xtraFields += ','+#temp->name
					#temp->value == 'NOW()' ? #xtraValues += ',NOW()' | #xtraValues += ',"'+#temp->value+'"'
				}
			}

			local(sSQL = '
				LOCK TABLE '+#cattable+' WRITE;
				
				SELECT @myRight := rgt FROM '+#cattable+' ORDER BY rgt DESC LIMIT 1;
				
				INSERT INTO '+#cattable+'('+#fieldname+', lft, rgt'+#xtraFields+',uniqueSeed) VALUES("'+(encode_sql(#txt))+'", @myRight + 1, @myRight + 2'+#xtraValues+',"'+#uniqueSeed+'");
				
				UNLOCK TABLES;
			')
			
			inline($gv_sql,-SQL=#sSQL) => {
				xs_iserror
				inline($gv_sql,-SQL='SELECT id FROM '+#cattable+' WHERE uniqueSeed = "'+#uniqueSeed+'" LIMIT 1') => {
					records => {
						return field('id')
					}
				}
			}
		}




		public deleteNode(-cattable::string,-id::integer) => {

			// DELETE A NODE
			local(sSQL = '
				LOCK TABLE '+#cattable+' WRITE;
	
				SELECT @myLeft := lft, @myRight := rgt, @myWidth := rgt - lft + 1
				FROM '+#cattable+'
				WHERE id = '+#id+';
				
				DELETE FROM '+#cattable+' WHERE lft BETWEEN @myLeft AND @myRight;
				
				UPDATE '+#cattable+' SET rgt = rgt - @myWidth WHERE rgt > @myRight;
				UPDATE '+#cattable+' SET lft = lft - @myWidth WHERE lft > @myRight;
				
				UNLOCK TABLES;
			')
			inline($gv_sql,-SQL=#sSQL) => {
				xs_iserror
			}
			
		}


		public moveNode(-cattable::string,-id::integer,-fieldname::string='name') => {
		/*
1		Calculate the branch width of the branch you want to move.
2		Update all lft and rgt values on the branch you want to move by multiplying them by -1.
3		Update all values on the tree as though the branch you just negated was deleted.
4		Update all lft values that are greater than the rgt value of the node you want to move the branch to by adding the branch width + 2 to them.
5		Update all rgt values that are greater than or equal to the rgt value of the node you want to move the branch to by adding the branch width + 2 to them.
6		Find the greatest negative lft value in the table, 
			which will be the top of the branch that you are moving, multiply it by -1 and call it x.
7		Find the lft value of the node that you want to attach the branch to, and call it y.
8		Calculate (y - x + 1) = z . Update all negative values in the table by subtracting z from them.
9		Update all negative values in the tree by multiplying them by -1.
		*/
		local(id2 = 0)
		// get immediate prior sibling
		local(sSQL = (
				'
			SELECT node.id, node.'+#fieldname+', (COUNT(parent.id) - (sub_tree.depth + 1)) AS depth, node.lft, node.rgt
			FROM '+#cattable+' AS node,
		        '+#cattable+' AS parent,
		        '+#cattable+' AS sub_parent,
		        (
		                SELECT node.'+#fieldname+', (COUNT(parent.id) - 1) AS depth
		                FROM '+#cattable+' AS node,
		                '+#cattable+' AS parent
		                WHERE node.lft BETWEEN parent.lft AND parent.rgt
		                AND node.id = 
		                		(
							SELECT parent.id
							FROM '+#cattable+' AS node,
							'+#cattable+' AS parent
							WHERE node.lft BETWEEN parent.lft AND parent.rgt
							AND node.id = '+#id+' AND parent.id != '+#id+'
							ORDER BY parent.lft DESC LIMIT 1
							)
		                GROUP BY node.'+#fieldname+'
		                ORDER BY node.lft
		        )AS sub_tree
			WHERE node.lft BETWEEN parent.lft AND parent.rgt
		        AND node.lft BETWEEN sub_parent.lft AND sub_parent.rgt
		        AND sub_parent.'+#fieldname+' = sub_tree.'+#fieldname+'
			GROUP BY node.id
			HAVING depth = 1
			ORDER BY node.lft ASC;'
				))
				inline($gv_sql,-SQL=#sSQL) => {
					records => {
						if(integer(field('id')) != #id) => {
							#id2 = integer(field('id'))
						else
							loop_abort
						}
					}
				}
				
				if(#id2 == 0) => {
					// here we are trying to ascertain if it's a root node!
					#sSQL = '
						SELECT node.id, node.'+#fieldname+', (COUNT(parent.id) - 1) AS depth
						FROM '+#cattable+' AS node,
						'+#cattable+' AS parent
						WHERE node.lft BETWEEN parent.lft AND parent.rgt
						AND node.id = '+#id+'
						GROUP BY node.id
						ORDER BY node.lft'
					inline($gv_sql,-SQL=#sSQL) => {
						records => {
							if(integer(field('depth')) == 0) => {
								// yay, it's a root node!!!
								#sSQL = '
									SELECT node.id, node.'+#fieldname+', (COUNT(parent.id) - 1) AS depth
									FROM '+#cattable+' AS node,
									'+#cattable+' AS parent
									WHERE node.lft BETWEEN parent.lft AND parent.rgt
									GROUP BY node.id
									HAVING depth = 0
									ORDER BY node.lft
								'
								inline($gv_sql,-SQL=#sSQL) => {
									records => {
										if(integer(field('id')) != #id) => {
											#id2 = integer(field('id'))
										else
											loop_abort
										}
									}
								}
							}
						}
					}
				}
				
				if(#id2 > 0) => {
				#sSQL = ('
					LOCK TABLE '+#cattable+' WRITE;
		-- 1			
					SELECT @myLeft := lft, @myRight := rgt, @myWidth := rgt - lft + 1 FROM '+#cattable+' WHERE id = '+#id2+';
		-- 2					
					UPDATE '+#cattable+' SET rgt = (rgt*-1), lft = (lft*-1) WHERE lft BETWEEN @myLeft AND @myRight;
		-- 3		
					UPDATE '+#cattable+' SET rgt = rgt - @myWidth WHERE rgt > @myRight;
					UPDATE '+#cattable+' SET lft = lft - @myWidth WHERE lft > @myRight;
		-- 4a
					SELECT @myLeft2 := lft, @myRight2 := rgt, @myWidth2 := rgt - lft + 1 FROM '+#cattable+' WHERE id = '+#id+';
		-- 4 & 5			
					UPDATE '+#cattable+' SET rgt = rgt + @myWidth WHERE rgt > @myRight2;
					UPDATE '+#cattable+' SET lft = lft + @myWidth WHERE lft > @myRight2;
		-- 6
		--			SELECT @x := (@myRight2 + 1) - (lft * -1) FROM '+#cattable+' WHERE id = '+#id+';
					SELECT @x := lft FROM '+#cattable+' WHERE id = '+#id+';
					SELECT @y := rgt FROM '+#cattable+' WHERE id = '+#id+';
		-- 8
					UPDATE '+#cattable+' SET rgt = (rgt - (@y - @x + 1)) WHERE rgt < 0;
					UPDATE '+#cattable+' SET lft = (lft - (@y - @x + 1)) WHERE lft < 0;
		
					UPDATE '+#cattable+' SET rgt = rgt * -1 WHERE rgt < 0;
					UPDATE '+#cattable+' SET lft = lft * -1 WHERE lft < 0;
		
					UNLOCK TABLES;
				')
				inline($gv_sql,-SQL=#sSQL) => { xs_iserror }
			}
		}

		public moveNodeTo(-cattable::string,-id::integer,-newparent::integer) => {

			local(sSQL = string);

			if(#newparent > 0 && #id > 0) => {
				#sSQL = ('
					LOCK TABLE '+#cattable+' WRITE;
		-- 1	, get boundaries of chunk to move
					SELECT @myLeft := lft, @myRight := rgt, @myWidth := rgt - lft + 1 FROM '+#cattable+' WHERE id = '+#id+';
		
		-- 2	, make chunk negative (ie move outta da way)		
					UPDATE '+#cattable+' SET rgt = ((rgt-@myRight)-1), lft = ((lft-@myRight)-1) WHERE lft BETWEEN @myLeft AND @myRight;
		
		-- 3	, collapse
					UPDATE '+#cattable+' SET rgt = rgt - @myWidth WHERE rgt > @myRight;
					UPDATE '+#cattable+' SET lft = lft - @myWidth WHERE lft > @myRight;

		-- 4, get boundaries of new parent
					SELECT @myRight2a := rgt FROM '+#cattable+' WHERE id = '+#newparent+';
										
		-- 5	, expand new parent + others to hold content
					UPDATE '+#cattable+' SET rgt = rgt + @myWidth WHERE rgt >= @myRight2a; -- note >= is new addition
					UPDATE '+#cattable+' SET lft = lft + @myWidth WHERE lft > @myRight2a;

		-- 6, get boundaries of new parent
					SELECT @myLeft2 := lft, @myRight2 := rgt, @myWidth2 := rgt - lft + 1 FROM '+#cattable+' WHERE id = '+#newparent+';

		
		-- 8, take all less than 0 and ad myRight2, puts it automagically in teh right pos
					UPDATE '+#cattable+' SET rgt = (rgt + @myRight2) WHERE rgt < 0;
					UPDATE '+#cattable+' SET lft = (lft + @myRight2) WHERE lft < 0;
					
					UNLOCK TABLES;
				')
				inline($gv_sql,-SQL=#sSQL) => { xs_iserror }
			}
		}


		public fullCatSQL(
			-cattable::string,
			-xtraReturn::string='',
			-xtraWhere::string='',
			-orderby::string='',
			-depth::integer=0,
			-fieldname::string='name'
			) => {

			local(depthComp = string)
			#depth > 0 ? #depthComp = 'HAVING depth <= '+#depth
			
			
			local(orderComp = 'node.lft')
			#orderby->size > 0 ? #orderComp = #orderby
			
			/*
				Returns full category list incl depth.
				To specify additional columns returned use xtraReturn parameter
				To specify additional restrictions in WHERE clause, use xtraWhere parameter
				
				An example of xtraReturn is as follows:
',
	(
		SELECT COUNT(*)
	        FROM asset, category AS subc
	        WHERE asset.category_id = subc.id
	        AND subc.lft BETWEEN node.lft AND node.rgt
	)AS chqty,
	(
	SELECT COUNT(asset.name) FROM asset WHERE asset.category_id = node.id
	)AS qty,
	(
        SELECT COUNT(*) - 1
        FROM category AS nnode
        WHERE nnode.lft BETWEEN node.lft AND node.rgt
    )AS nchild'				
			*/
			return ('
				SELECT 
					node.id, node.'+#fieldname+', (COUNT(parent.id) - 1) AS depth '+#xtraReturn+'
				FROM '+#cattable+' AS node,
				'+#cattable+' AS parent
				WHERE node.lft BETWEEN parent.lft AND parent.rgt '+#xtraWhere+'
				GROUP BY node.id
				'+#depthComp+'
				ORDER BY '+#orderComp)

		}


		public subTreeSQL(
			-cattable::string,
			-id::integer,
			-xtraReturn::string='',
			-xtraWhere::string='',
			-relative::boolean=false,
			-depth::integer=0,
			-fieldname::string='name'
			) => {

			#relative == false ? local('relatives' = '1') | local('relatives' = '(sub_tree.depth + 1)')
			local(depthComp = string)
			#depth > 0 ? #depthComp = 'HAVING depth <= '+#depth

			//(sub_tree.depth + 1) - makes the depth relative to the one requested
			//HAVING depth <= 1 - limits how many subs it pulls in

/*
================================================================================
From Pier 23/05/2006 16:26

Added node.id to the nested SELECT so that we can replace
	[...] sub_parent.name = sub_tree.name [...]
with 
	[...] sub_parent.id = sub_tree.id [...]
================================================================================
*/
			local(out = 'SELECT node.id, node.'+#fieldname+', (COUNT(parent.id) - '+#relatives+') AS depth '+#xtraReturn+'
				FROM '+#cattable+' AS node,
				        '+#cattable+' AS parent,
				        '+#cattable+' AS sub_parent,
				        (
				                SELECT node.id, node.'+#fieldname+', (COUNT(parent.id) - 1) AS depth
				                FROM '+#cattable+' AS node,
				                '+#cattable+' AS parent
				                WHERE node.lft BETWEEN parent.lft AND parent.rgt
				                AND node.id = '+#id+'
				                GROUP BY node.'+#fieldname+'
				                ORDER BY node.lft
				        )AS sub_tree
				WHERE node.lft BETWEEN parent.lft AND parent.rgt
				        AND node.lft BETWEEN sub_parent.lft AND sub_parent.rgt
				        AND sub_parent.id = sub_tree.id '+#xtraWhere+'
				GROUP BY node.id
				'+#depthComp+'
				ORDER BY node.lft
				;')
			return #out
		}
		


		public showPathSQL(
			-cattable::string,
			-id::integer,
			-xtraReturn::string='',
			-xtraWhere::string='',
			-fieldname::string='name'
			) => {

			local(out = 'SELECT node.id, node.'+#fieldname+', (COUNT(parent.id) - 1) AS depth '+#xtraReturn+'
	FROM '+#cattable+' AS node,
	        '+#cattable+' AS parent,
	        (
	        	SELECT sub.lft AS sublft, sub.rgt AS subrgt
	        	FROM '+#cattable+' AS sub
	        	WHERE sub.id = '+#id+'
	        ) AS sub
	WHERE 
			node.lft <= sub.sublft
        AND 	node.rgt >= sub.subrgt
		AND node.lft BETWEEN parent.lft AND parent.rgt '+#xtraWhere+'
	GROUP BY node.id
	ORDER BY node.lft
				;')
				return #out
		}
		
		public getParent(
			-cattable::string,
			-id::integer,
			-xtraWhere::string='',
			-fieldname::string='name',
			-fieldurl::string='page_url'
			) => {

			local(out = map)
			local(sSQL = 'SELECT 
					parent.id,parent.'+#fieldname+',parent.'+#fieldurl+'
				FROM 
					'+#cattable+' AS node,
					'+#cattable+' AS parent
				WHERE 
					node.lft BETWEEN parent.lft AND parent.rgt
					AND node.id = '+#id+'
					AND parent.id != node.id
					'+#xtraWhere+'
				ORDER BY 
					parent.lft DESC
				LIMIT 1')
			inline($gv_sql,-SQL=#sSQL) => {
				records => {
					#out->insert('id'=field('id'),'parentname'=field(#fieldname),'page_url'=field(#fieldurl))
				}
			}
			return #out
		}		
		public getParentId(
			-cattable::string,
			-id::integer,
			-xtraWhere::string=''
			) => {

			local(out = integer)
			local(sSQL = 'SELECT 
					parent.id
				FROM 
					'+#cattable+' AS node,
					'+#cattable+' AS parent
				WHERE 
					node.lft BETWEEN parent.lft AND parent.rgt
					AND node.id = '+#id+'
					AND parent.id != node.id
					'+#xtraWhere+'
				ORDER BY 
					parent.lft DESC
				LIMIT 1')
			inline($gv_sql,-SQL=#sSQL) => {
				records => {
					return integer(field('id'))
				}
			}
			return 0
		}		
		
		
		public getURLpath(
			-cattable::string,
			-id::integer,
			-fieldurl::string='page_url'
			) => {


			local(out = '/')
			local(sSQL = '
				SELECT node.id, node.'+#fieldurl+', (COUNT(parent.id) - 1) AS depth 
				FROM '+#cattable+' AS node,
				       '+#cattable+'  AS parent,
				        (
				        	SELECT sub.lft AS sublft, sub.rgt AS subrgt
				        	FROM '+#cattable+' AS sub
				        	WHERE sub.id = '+#id+'
				        ) AS sub
				WHERE 
						node.lft <= sub.sublft
			        AND 	node.rgt >= sub.subrgt
					AND node.lft BETWEEN parent.lft AND parent.rgt 
				GROUP BY node.id
				ORDER BY node.lft')
			inline($gv_sql,-SQL=#sSQL) => {
				records => {
					#out += field(#fieldurl) + '/'
				}
			}
			return #out
		}	
		
	}

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