+-- Ground level -----------------------------------------------------------------------------------------------------------------------------------------+
| |
| * |
| \ |
| < |
| *--*--* * * * * |
| | /| / / \ / |
| | / | / / \ / |
| * * * * *--* * * |
| | / \ /| / \ |
| | / \ / | / \ |
| *--*--* * *--*--* *--* |
| | \ |
| | \ |
| * * *--* |
| \ \ \ |
| \ \ \ |
| * *--* * * *--*--* * * |
| \ | / \ /| \ | \ \ |
| \ | / \ / | \ | \ \ |
| * * *--*--* *--*--* * *--* * * *--*--* |
| \ \ / | / | \ \ |
| \ \ / |/ | \ \ |
| *--*--*--*--*--*--* * *--* * * |
| / / \ / \ \ |
| / / \ / \ \ |
| * * * * * * |
| / / / \ / |
| / / / \ / |
| * * * * * * |
| | / \ / \ \ / |
| | / \ / \ \ / |
| * * * * * * |
| | / \ / \ \ |
| | / \ / \ \ |
| * * * * * |
| \ / / / \ |
| \ / / / \ |
| * * * * * * |
| \ / / \ < |
| \ / / \ > |
| * *--* * * * * * |
| \ / / \ / \ / \ / |
| \ / / \ / \ / \ / < |
| * * * * * * * * * * * |
| \ / / \ / \ / \ / \ / |
| \ / / \ / \ / \ / \ / |
| * * * * * * * * * * |
| \ / / \ / / \ / \ / \ \ / |
| \ / / \ / / \ / \ / \ \ / |
| * * * * * * * * * * * |
| \ \ \ \ \ / > / \ / |
| \ \ \ \ \ / / \ / |
| * * * * * *--*--* * |
| \ \ \ / \ / |
| \ \ \ / \ > / |
| * M * * * * * * |
| \ / / \ / | / \ |
| \ / / \ / | / \ |
| * * * * * * * * |
| / / \ /| / \ / |
| / / \ / | / \ / |
| * * * * * * * * |
| / / \ / | / \ / |
| / / \ / | / \ / |
| M * * * * * * |
| \ / \ / |
| \ / \ / |
| * * * * |
| \ \ / |
| \ \ / |
| M * * * |
| \ / \ \ / |
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| * * * * * |
| \ / / \ / |
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| * * * * * |
| / / \ / / |
| / / \ / / |
| * * * * |
| / / \ / |
| / / \ / |
| * * * * * |
| \ / / \ / |
| \ / / \ / |
| * * * * |
| / \ / v\ / |
| / \ / \ / |
| M * * * * |
| / \ / |
| / \ / |
| * * |
| / |
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| * |
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| * |
| / \ |
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| * * |
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| * * |
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| * |
| / |
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+---------------------------------------------------------------------------------------------------------------------------------------------------------+