·····                                  
·····                                  
 ·····                                 
  ▒···                                 
  ▒···▒▒▒▒                             
  ▒·>····▒▒                            
▒▒▒·······▒▒                           
·······<O··▒                           
·····$·····▒▒▒                         
·············▒                         
···▒▒▒▒▒▒▒········                     
··       ·········                     
·       ▒▒▒▒······                     
            ····<·                     
            ······                     
          ∆  ▒▒▒··                     
                ▒·