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|   |  |   |  o      |  |   |
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|          |  o      |      |
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    |  |   |  o  |      |   |
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    |  |      o  |      |   |
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    |      |  o  |      |   |
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    |      |  o  |      |   |
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    |      |  o  |      |   |
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|   |  |   |     |      |   |
|   |  |   |  o  |      |   |
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|   |      |  o      |      |
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|   |  |   |     |      |   |
|   |  |   |  o  |      |   |
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|   |  |   |  o      |      |
|   |  |   |         |      |
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|   |      |     |      |   |
|   |      |  o  |      |   |
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|   |      |  o      |      |
|   |      |         |      |
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|   |  |         |      |   |
|   |  |      o  |      |   |
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|   |  |   |  o      |      |
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+---+  +---+     +---+  +---+
|   |  |         |      |   |
|   |  |      o  |      |   |
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|   |      |  o      |      |
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+---+  +   +     +---+  +---+
|   |  |   |     |      |   |
|   |  |   |  o  |      |   |
+   +  +---+     +---+  +---+
|   |      |  o      |      |
|   |      |         |      |
+---+      +     +---+  +---+


+---+  +---+     +---+  +---+
|   |      |     |      |   |
|   |      |  o  |      |   |
+   +  +---+     +---+  +---+
|   |      |  o      |      |
|   |      |         |      |
+---+  +---+     +---+  +---+


+---+  +---+     +---+  +---+
|   |      |     |      |   |
|   |      |  o  |      |   |
+   +  +---+     +---+  +---+
|   |  |      o      |      |
|   |  |             |      |
+---+  +---+     +---+  +---+


+---+      +     +---+  +---+
|   |      |     |      |   |
|   |      |  o  |      |   |
+   +      +     +---+  +---+
|   |      |  o      |      |
|   |      |         |      |
+---+      +     +---+  +---+


+---+  +---+     +---+  +---+
|   |  |   |     |      |   |
|   |  |   |  o  |      |   |
+   +  +   +     +---+  +---+
|   |  |   |  o      |      |
|   |  |   |         |      |
+---+  +---+     +---+  +---+


end