+     +-----+-----+-----+-----+-----+     +
            "     "     |     "           |
            "     "     |     "           |
            "     "     |     "           |
+=====+=====+-----+=====+-----+=====+=====+
|     |     |     "     "     |     |     |
|     |     |     "     "     |     |     |
|     |     |     "     "     |     |     |
+-----+-----+-----+=====+-----+-----+=====+
|     |     |     |     "     |     "     |
|     |     |  8  |  2  "  5  |     "     |
|     |     |     |     "     |     "     |
+=====+=====+=====+=====+-----+=====+-----+
|     |     |     "     "     "     |     |
|     |     |  4  "     "  7  "     |     |
|     |     |     "     "     "     |     |
+-----+-----+=====+     +=====+-----+-----+
|     |     "     "     "     |     |     |
|     |  7  "  6  "     "  1  |  5  |     |
|     |     "     "     "     |     |     |
+-----+-----+-----+=====+=====+-----+-----+
|     |     "     |     |     "     |     |
|     |     "     |  2  |     "     |     |
|     |     "     |     |     "     |     |
+=====+-----+-----+-----+-----+=====+=====+
      "     "     |     |     |     "     |
      "     "     |     |     |     "     |
      "     "     |     |     |     "     |
+-----+-----+-----+-----+-----+-----+-----+