00000000000       1111111       
    00           00   1       1      
   00             00  1         1     
  00     0000     00  1         1     
  00    0    0    00   1       1      
  00    0    0    00    1111111       
  00     0000     00  1         1     
   00             00  1         1     
    00           00    1       1      
      00000000000       1111111       
           00                         
         00  00                       
       00      00                     
     00          00                   
   00              00