10 A supermarket shopping trip

      1            2     3   
                    
 4      5     6       7         
8          9              
     10                 
 11                     
           12           
  13                    
            14    15      16    
 17            18           
   19         20            
                    
          21            
       22               
                    
23      24    25          26       27   
                    
                    
  28                    
              29