▒·      ··
                     ▒·▒·     ···
                     ▒·▒·▒▒▒▒▒·▒ 
                     ▒·▒·······▒ 
                  ▒▒▒▒·······▒·▒▒
                  ···············
                  ···········▒▒▒▒
                     ▒···········
                     ▒·······▒▒▒▒
                     ▒··b····▒   
                     ▒·······▒   
              ▒▒▒▒▒▒▒▒▒▒▒·▒▒▒▒   
              ▒·········@·▒      
              ▒·▒▒▒▒▒▒▒▒▒▒▒      
              ▒·▒                
              ▒·▒                
              ▒·▒                
              ▒·▒                
         ▒▒▒▒▒▒·▒                
▒▒▒▒     ▒······▒                
▒···▒▒▒▒▒▒·▒▒▒▒▒▒                
  ▒·<··÷···▒                     
▒···▒▒▒▒▒▒▒▒                     
▒▒▒▒