1111111111111111         
    11tttttttttt111iii       
    1fLLLLLLLLLLLLft11i      
    ifLLLfttttfffLLLLt1      
    ifLLL1iiii1i11fLLLt      
    ifLLL1iiiiiiiitLLLt      
    ifLLL1iiiiiii1fLLf1      
    ifLLLftttttffLLLf1i      
    itLLLLLLLLLLLfttiii      
    itffft11tfffftiiii       
    itfff1iiiitffftii        
    itfff1  iiitffftiii      
    itfff1   iiitffftiii     
    itfffi    iiitffftiii    
    itfffi     iiitffftii    
    i1111i      iii1111ii    
    iiiiii        iiiiiii