3w
 +-----------------+
8| r r r r r r r r |
7| h   c   e c h d |
6| d   X   m X     |
5|                 |
4|         E       |
3|     X   R X     |
2| H D C M   C D H |
1| R R R R   R R R |
 +-----------------+
   a b c d e f g h
