_ 
| |
|_|

 _ 
 _|
|_ 

 _ 
|_ 
|_|

 _ 
 _|
|_ 

 _ 
  |
  |

 _ 
|_ 
|_|

 _ 
|_ 
 _|

 _ 
 _|
|_ 

   
|_|
  |

 _ 
|_ 
 _|

 _ 
|_|
|_|

 _ 
| |
|_|

 _ 
|_ 
|_|

Edit in JS Bin