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0 _      _ 3
   \    /   
...
    /  \    
4 _/    \_ 1

0 ___    ___ 3
     \  /
...
3 _/  \/  \_ 0
      /\    
4 ___/  \___ 1

0 _____  _____ 3
       \/  
...
3 _/  \  /  \_ 0
       \/
4 _____/\_____ 1

0 _____  _____ 3
       \/  
...
3 _/   /\   \_ 0
      /  \
4 ___/    \___ 1