+--------------+
               | Organization |
               +------+-------+
                      |                                           
     +----------+-----+----+----------+
     |          |          |          |
 +---+---+  +---+---+  +---+---+  +---+---+
 |   d1  |  |   d2  |  |   d3  |  |   d4  |
 +---+---+  +---+---+  +---+---+  +---+---+
     |          |          |          |
 +---+---+  +---+---+  +---+---+  +---+---+
 |       |  |       |  |       |  |       |
 +---+---+  +---+---+  +---+---+  +---+---+
     |          |          |          |
 +---+---+  +---+---+  +---+---+  +---+---+
 |       |  |       |  |       |  |       |
 +---+---+  +---+---+  +---+---+  +---+---+
     |          |          |          |
 +---+---+  +---+---+  +---+---+  +---+---+
 |       |  |       |  |       |  |       |
 +---+---+  +---+---+  +---+---+  +---+---+