For the processing of P+ID drawings
| 
                         Key  | 
                    
                         Function  | 
                
|---|---|
| 
                     V  | 
                
                     Previous sheet  | 
            
| 
                     N  | 
                
                     Next sheet  | 
            
| 
                     B  | 
                
                     Last processed P+ID sheet  | 
            
| 
                     E  | 
                
                     Edit symbol  | 
            
| 
                     S  | 
                
                     Load symbol  | 
            
| 
                     Q  | 
                
                     Load symbol according to reference symbol  | 
            
| 
                     W  | 
                
                     Load previously loaded symbol  | 
            
            
        
| 
                             
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