+-------------++---+
|      A      || E |
+-------------++---+
  ^    ^    ^    ^
  |    |    |    |
  |    |    |    |
  v    v    v    |
+---++---++---+  |
| B || C || D |  |
+---++---++---+  |
  ^    ^    ^    |
  +----+----+----+