+---------+      +------+
   |         |      |      |
   |    H    B------D      G
   |         | +---/| AS2  |\  +------+
   |         |/     +------+ \ |      |---L/8
   A   AS1   C---+            \|      |
   |         |\\  \  +------+ /| AS4  |---M/8
   |         | \\  +-E      |/ +------+
   |    X    |  \\   |      K
   |         |   +===F AS3  |
   +---------+       +------+