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8 months ago

297 B

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+---+---+---+
| X | X   X |
+   +---+   +
| X | F   X |
+   +---+---+
| F | F   F |
+---+---+---+

+---+---+---+
| F | F   X |
+---+---+   +
| F   B | F |
+---+   +---+
|   | B |   |
+---+---+---+

+---+---+---+
| B | B | X |
+   +   +   +
| B | X | B |
+---+   +   +
| B   X | B |
+---+---+---+