###########             
                         ...........  ....       
                           ........   ....       
                            ......#   ...        
                             #....#   ..#        
                             #..2.#   ..#        
                          ..##....#   ..#        
                          #∩......####..#####    
                          ##+####............    
                             ...#####'#######    
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                             ###########+#...    
                                          ...    
                                           ..    
                                                 
                                                 
                                                 
                               ∆