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 		 	  	c		 	 
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 		 	  			 	  	f		 	  	1		 	           
     		 	           
     		 	 

 		 	  	WHILE		 	  	c		 	                            20		 	           
     DO		 	  			 	  			 	                            		 	                            j		 	           
     		 	 

 		 	  	h		 	 
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 		 	  	c		 	       
 			 	 
 1		 	           
     		 	           
     