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 ········(·(▒▒▒▒·P····)· 
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·············(···········
 PP·····<)····(S·········
·P···········▒▒··▒·······
 ·▒··▒···P·▒·▒▒▒▒······· 
 ·P· ▒····▒·▒··  ······· 
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    ··▒P·PPP···· ····    
       ·PPP▒ ·   ·