===0===
          | d|g |
          |1|2|3|
          =======
           | | |
     ------  |  -------
    |        |         |
===1===   ===2===   ===3===
|a|b|c|   |d|e|f|   |g|h|i|
|-|-|-|   |-|-|-|   |-|-|-|
|*|*|*|   |*|*|*|   |*|*|*|
|*|*|*|   |*|*|*|   |*|*|*|
|*|*|*|   |*|*|*|   |*|*|*|