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   |        |        |                    |  |
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|     |     |     |        |  |     |  |     |
+--+--+  +--+--+  +--+--+--+  +  +  +--+--+  +
|        |        |     |  |  |  |           |
+  +  +--+  +--+--+--+  +  +  +--+--+--+--+  +
|  |     |     |     |  |  |     |        |  |
+--+--+  +--+  +  +  +  +  +--+  +  +--+  +  +
|        |  |  |  |  |  |  |     |  |     |  |
+  +--+--+  +  +  +  +  +  +  +--+  +  +--+  +
|        |  |  |  |     |  |  |     |  |     |
+  +--+--+  +  +  +--+--+  +  +  +--+  +--+--+
|  |        |  |     |     |  |     |  |     |
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|     |           |  |        |     |  |  |  |
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|  |  |        |  |  |              |        |
+  +  +  +  +--+  +  +  +--+--+  +  +--+  +  +
|        |     |     |     |  |  |     |  |  |
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|     |  |     |     |     |           |     |
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|  |     |  |     |              |     |     |
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|  |  |  |  |        |           |  |  |     |
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|     |  |  |  |     |     |  |     |     |  |
+  +--+  +  +  +--+  +  +  +  +  +--+  +--+  +
|     |     |        |  |     |        |      
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