+-- Level +2 ------------------------------+
| |
| *--* |
| | | |
| | | |
| %--* * <* |
| v v | |
| | ^ |
| *--* |
| |
| |
| <% * |
| v | |
| | |
| *--* *--* |
| | v | v |
| ^ < | ^ | |
| *> * *--*> * *--* |
| | | | | | |
| | | | | | |
| *--* *--* %--* |
| v |
| |
| |
| |
| |
| *--* *--* % |
| | v | v |v |
| | | ^ | ^ |
| %> * <* <*--*--* *--* |
| v | | | |
| | | | ^ |
| *--* *--* |
| |
| |
| |
| |
| |
| *--* |
| | | |
| | | |
| *> * <*--* |
| v | |
| | |
| %--* |
| v |
| |
+------------------------------------------+
+-- Level +1 ------------------------------+
| ^ |
| % |
| |
| |
| |
| |
| ^ |
| % |
| |
| |
| % |
| |v |
| | |
| P |
| | |
| |^ |
| % |
| |
| |
| |
| |
| ^ |
| % |
| |
| ^ |
| % |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| * |
| | |
| |^ |
| %--* |
| |
+------------------------------------------+
+-- Ground level --------------------------+
| |
| * |
| < \ |
| \ > |
| *--* * * *--* |
| \ / \ / |
| \ / \ / |
| * * * |
| < \ |
| > \ |
| * * |
| \ / |
| \^/ |
| % |
| / \ |
| / \ |
| * * |
| > / |
| < / |
| * * * |
| / \ / \ |
| / \ / \ |
| * * * * |
| > / > / |
| < / < / |
| * * |
| |
| |
| *--* |
| v / |
| ^ < / |
| % * *--% |
| v > v |
| |
+------------------------------------------+
+-- Level -1 ------------------------------+
| |
| % |
| |v |
| | |
| P |
| | |
| |^ ^ |
| % % |
| |
+------------------------------------------+
+-- Level -2 ------------------------------+
| ^ |
| *--* |
| |
| |
| |
| |
| |
| *> *--* <* |
| | v | | |
| | |^ | |
| % *--%--* * |
| v | | | |
| | | ^ | |
| *> *--* <* |
| |
| |
| |
| |
| |
| *--* |
| v |
| |
+------------------------------------------+
+-- Level -3 ------------------------------+
| ^ |
| P |
| |
+------------------------------------------+