Richard_15_x_2222.txt

Get from a to b. XXes in the cells are floors.


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX|  |XX|   XX   |XX|  |  |  |  |XX   |XX|  |
+  +--+  +  +  +--+  +--+--+--+--+--+--+  +--+
|  |XX    XX|XX|XX    XX|  |XX    XX|XX XX   |
+  +--+  +--+  +--+  +--+--+--+  +--+--+  +--+
|XX XX|XX|XX|XX|XX XX|XX|XX|XX|XX   |XX    XX|
+--+--+  +  +--+--+--+  +  +  +--+--+--+--+--+
|   XX|XX|XX|XX|  |XX|  |XX|  |   XX XX|XX XX|
+--+--+--+  +  +  +  +--+  +  +--+--+  +  +--+
|  |XX    XX XX XX XX XX XX    XX|XX XX   |XX|
+--+--+  +--+  +--+  +--+--+--+  +  +--+--+  +
|XX|XX|  |     |XX XX|  |XX   |  |XX|XX XX|  |
+  +  +--+  +--+--+  +--+--+--+--+--+  +  +  +
|  |  |XX   |  |     |XX   |XX   |  |XX|  |XX|
+  +  +  +  +--+--+  +--+  +--+--+--+--+--+  +
|XX|  |XX|XX|XX    XX|XX XX XX|   XX|  |XX|XX|
+  +  +--+  +--+  +  +--+--+--+--+--+--+  +--+
|XX|XX XX|XX|  |XX|XX|  |   XX|XX XX|   XX|  |
+--+  +--+--+--+  +  +--+  +  +  +--+  +  +  +
|XX|XX|  |   XX XX|XX|  |XX|XX|XX XX|XX|XX|XX|
+  +--+  +--+--+  +--+--+--+--+  +--+--+  +  +
|  |  |XX XX|XX XX|   XX|  |  |  |XX XX|  |XX|
+--+--+--+  +  +  +  +--+  +--+  +--+  +--+--+
|     |XX|XX|XX|XX|XX|  |XX|  |      XX|  |XX|
+--+--+  +--+--+--+--+--+--+  +--+--+  +--+  +
|   XX XX XX|XX XX   |XX|XX XX XX|XX XX|   XX|
+  +  +  +--+--+  +  +  +  +  +--+--+  +  +  +
|XX|XX|XX|  |XX XX|XX XX|XX|  |XX    XX|XX|XX|
+--+  +--+--+--+  +--+--+--+  +--+  +  +--+  +
|  |   XX|  |     |  |   XX|XX XX|XX|XX|XX   |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX    XX|XX|XX          XX XX XX|XX   |   XX|
+--+--+--+--+--+--+  +  +  +--+  +--+--+--+--+
|XX   |XX XX|  |XX   |  |XX|XX    XX XX|XX XX|
+  +--+--+--+--+--+  +--+--+  +--+--+--+--+--+
|XX|  |XX|XX XX|  |XX|XX|  |XX|  |XX|XX    XX|
+--+--+  +  +--+--+--+  +--+--+--+  +--+  +--+
|XX   |  |XX XX XX XX|  |  |   XX|XX XX|XX|XX|
+--+--+--+--+  +--+--+--+  +--+--+--+--+--+  +
|XX|  |XX|XX XX|  |XX|XX|XX|XX|XX   |XX|XX|  |
+  +  +--+--+--+--+  +  +  +--+--+  +  +--+  +
|XX|XX|XX|XX|XX XX|  |XX XX XX|XX|XX XX|XX|  |
+  +--+--+--+  +--+--+--+--+--+--+  +--+  +  +
|  |   XX|  |XX|XX|  |     |XX|   XX|XX    XX|
+  +--+--+  +--+--+--+  +  +  +--+  +--+  +--+
|XX|XX|XX XX XX|XX|XX|XX|XX XX|  |XX|XX|XX|  |
+--+--+--+--+--+  +  +--+  +--+  +--+  +--+--+
|XX   |   XX|XX XX XX|      XX|XX|  |   XX XX|
+--+--+--+--+--+--+--+  +--+  +--+--+  +--+--+
|  |  |  |XX|   XX|XX XX XX|XX XX|XX|   XX|XX|
+  +  +--+--+  +  +  +--+--+--+--+  +  +--+  +
|  |XX XX|  |  |XX|XX|  |XX XX XX   |  |  |  |
+  +--+  +  +  +--+  +--+--+  +--+--+  +--+--+
|XX|XX|XX|XX|XX|XX XX|XX XX   |XX|XX|XX    XX|
+  +--+--+  +--+--+--+--+--+  +  +--+--+  +--+
|XX    XX|XX|XX XX    XX|XX|XX|XX|XX|XX XX|XX|
+  +  +--+--+--+--+  +--+  +--+--+  +--+--+  +
|  |XX XX XX|  |XX XX|XX XX XX|XX XX|  |   XX|
+  +--+--+--+--+--+  +--+--+--+--+  +--+  +--+
|  |Xa|  |  |  |XX|XX XX XX XX|  |XX|  |XX|  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX   |XX XX|  |XX|XX|     |  |  |XX|  |  |  |
+--+--+--+  +  +--+--+--+--+  +--+  +--+  +--+
|  |XX   |  |XX|XX|XX|  |  |XX    XX XX|XX XX|
+--+--+--+--+--+  +--+--+--+--+--+  +--+--+--+
|XX|XX|  |  |XX    XX|XX|  |XX|  |XX|XX    XX|
+  +  +--+--+--+  +--+  +--+  +--+--+--+--+--+
|XX    XX|XX XX XX    XX   |  |  |  |  |   XX|
+--+  +--+--+  +--+--+  +--+  +--+--+  +--+--+
|XX|XX|  |  |XX|  |  |XX XX|XX|XX XX XX|  |XX|
+  +  +--+--+  +--+--+  +--+--+--+--+--+--+--+
|  |XX|  |XX|XX|XX XX XX|XX|      XX XX|XX|XX|
+  +  +--+  +--+  +--+--+  +--+--+--+--+  +--+
|XX   |  |XX|   XX|XX|XX|  |XX|XX|   XX|   XX|
+--+  +--+--+  +  +--+--+  +  +--+  +--+  +--+
|XX   |XX|XX   |XX XX|XX XX|XX   |XX|  |XX|  |
+--+  +  +--+--+  +--+--+--+--+--+--+  +--+  +
|  |XX|  |XX    XX|  |XX|XX|XX            |XX|
+--+  +--+--+  +--+--+  +--+  +--+  +--+  +  +
|XX|XX XX|XX   |XX XX XX|  |XX|XX XX|XX|  |  |
+--+  +  +--+--+--+--+  +  +--+  +  +--+--+--+
|XX XX|     |XX XX|XX XX|XX|XX XX|  |XX|XX|  |
+  +--+--+  +--+--+  +  +--+--+--+  +--+--+  +
|      XX|XX|  |  |XX|XX|XX XX|  |XX XX|XX|XX|
+  +--+--+--+--+--+--+--+  +--+--+--+--+--+--+
|XX|XX XX   |XX   |   XX|XX|  |XX|  |  |XX|  |
+--+--+--+  +  +--+  +--+--+--+  +--+--+  +--+
|XX|  |  |XX|XX|  |XX|   XX XX XX|  |XX   |  |
+--+  +--+--+--+--+--+--+  +  +--+  +--+  +--+
|  |XX|     |XX|  |  |XX XX|XX XX|   XX|XX|XX|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX XX|XX|XX|XX         |XX|XX|  |XX   |XX   |
+--+  +  +  +--+--+  +--+  +--+--+--+--+  +--+
|XX|   XX|XX XX XX   |XX|XX|  |  |   XX|   XX|
+  +  +--+  +--+--+--+--+--+--+--+  +--+--+--+
|  |   XX|XX|XX|XX XX|  |  |XX|  |XX|   XX XX|
+  +  +--+--+  +--+--+  +--+  +--+--+--+--+--+
|XX|  |  |  |  |XX XX|XX|  |   XX|   XX|  |  |
+  +  +--+--+--+--+--+--+--+  +  +  +--+  +--+
|XX|XX|   XX|XX XX XX   |  |XX|XX|  |XX XX XX|
+--+--+  +--+--+  +--+--+--+--+  +  +--+  +--+
|XX|   XX|XX|XX XX|  |  |  |XX|XX|  |XX|XX XX|
+--+--+--+  +--+--+--+--+  +--+  +--+  +--+--+
|  |XX|XX|  |XX|XX|XX|XX XX|  |XX|  |XX    XX|
+  +--+  +--+--+  +  +--+  +--+--+--+--+--+--+
|XX|XX XX XX|XX|XX   |  |XX|  |  |XX|   XX|  |
+--+  +  +--+--+  +--+--+--+--+--+  +--+--+  +
|   XX|  |   XX|XX   |XX   |     |  |XX|XX|XX|
+  +--+--+--+--+--+  +--+--+--+  +  +--+--+--+
|XX|XX   |  |XX|XX   |  |XX XX   |XX|XX XX|XX|
+--+--+--+--+--+--+--+--+  +--+  +--+--+  +--+
|  |  |XX|XX|XX       XX|  |  |XX|XX|  |XX XX|
+--+--+--+--+--+  +--+  +  +--+--+--+--+  +--+
|XX|XX XX XX|XX XX|XX XX XX   |XX    XX|XX XX|
+  +  +--+--+  +--+--+  +--+--+--+--+--+--+--+
|XX|XX|  |XX|XX|XX    XX|   XX|XX   |  |XX|  |
+  +  +--+--+--+--+--+--+--+--+  +  +--+  +  +
|XX|XX XX XX|  |XX    XX|XX XX XX|XX XX|XX XX|
+--+  +--+--+--+  +  +  +  +--+--+--+--+  +  +
|XX|XX|XX|XX XX XX|XX|XX|XX|XX    XX XX|  |  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|   XX|         XX|XX|XX XX|      XX|XX|XX XX|
+--+--+--+  +  +  +--+--+--+--+--+--+  +--+--+
|  |XX|  |XX|XX|XX|XX|XX   |XX|XX XX|     |  |
+--+--+--+  +  +--+--+--+  +  +--+  +  +  +--+
|  |XX|  |XX|XX|XX   |  |XX XX XX   |XX|XX|  |
+--+--+--+--+--+--+  +--+--+  +--+  +--+  +--+
|XX XX   |XX|XX   |XX|XX XX XX   |XX XX|XX|  |
+--+--+--+  +  +--+--+--+--+--+--+--+  +--+--+
|XX XX XX   |XX|XX|  |     |XX XX|XX|XX      |
+  +--+--+--+  +  +  +--+--+  +--+--+--+  +--+
|XX|XX|XX XX XX XX XX XX   |   XX|XX|XX XX|  |
+--+--+--+--+  +--+--+--+--+  +--+--+--+  +  +
|  |XX XX XX XX|XX|  |  |  |XX|XX XX XX XX   |
+  +--+--+--+--+  +--+  +--+--+--+  +  +--+  +
|XX|XX   |  |  |  |XX|XX XX|  |  |XX|  |  |XX|
+--+--+--+--+--+  +--+  +  +  +--+--+  +--+  +
|XX|XX XX|XX|  |   XX XX|  |  |XX|XX|XX XX|XX|
+--+--+--+--+  +  +--+  +  +--+--+--+--+  +--+
|XX|     |XX XX|XX|  |  |  |      XX|  |   XX|
+  +--+  +  +--+--+--+--+--+--+--+  +--+  +--+
|   XX|XX|XX XX|XX|XX|XX    XX|  |XX|XX XX XX|
+  +  +  +--+--+--+  +--+--+--+--+--+  +  +--+
|XX|XX|XX|XX   |XX XX|  |XX|XX|  |XX   |   XX|
+--+--+--+--+  +--+--+--+  +--+  +  +  +--+  +
|XX    XX|  |   XX XX|  |XX    XX|  |XX|  |  |
+--+  +--+--+  +--+  +--+  +  +--+  +  +  +--+
|XX XX|  |XX   |  |  |XX XX|XX|XX|XX|  |XX XX|
+--+--+--+--+  +--+  +--+--+--+  +--+  +--+--+
|XX   |XX   |XX|  |XX    XX|  |XX XX|XX|XX|  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|   XX|XX|  |XX XX|XX XX XX   |XX|XX   |   XX|
+--+  +--+--+--+--+--+--+--+  +--+--+  +--+  +
|XX      |  |XX|   XX|XX   |     |   XX|XX|  |
+--+  +--+--+  +--+  +--+--+  +--+  +--+--+--+
|XX   |XX|  |XX|XX XX    XX|XX XX|XX XX XX|XX|
+--+  +  +--+  +--+--+  +--+  +--+  +--+--+  +
|XX XX    XX XX|XX|XX|   XX   |XX|XX|  |XX|XX|
+--+--+  +  +  +--+  +--+  +--+  +--+--+  +  +
|XX|  |XX|  |XX|XX   |XX|XX|  |  |  |XX   |XX|
+  +--+--+  +--+--+  +--+  +  +--+--+--+  +--+
|  |XX   |XX XX|XX XX XX|  |XX|XX|   XX|XX|XX|
+  +--+--+--+--+  +--+--+  +--+  +--+--+  +--+
|XX XX|   XX|   XX|XX XX XX   |XX    XX|  |XX|
+  +--+--+--+  +--+--+  +--+--+  +  +--+--+--+
|XX|XX XX XX   |XX|  |  |  |XX|XX|XX XX   |  |
+--+--+--+--+  +--+--+--+  +--+--+--+--+--+--+
|XX XX   |XX XX|  |XX   |  |XX|XX   |XX   |  |
+  +--+  +--+--+--+--+--+--+--+--+--+  +--+  +
|XX|XX|XX|   XX|XX XX|XX|XX|XX|XX|XX XX|  |XX|
+--+--+  +--+--+--+  +  +--+--+--+--+--+--+--+
|XX XX XX|XX XX|XX|  |  |      XX|XX XX    XX|
+  +--+  +  +--+  +--+  +--+--+--+--+--+--+--+
|  |      XX|XX|   XX XX|XX   |  |  |XX|   XX|
+  +  +--+  +--+--+--+  +--+--+--+--+--+  +--+
|XX|XX XX|XX|  |XX|  |XX XX|XX|XX XX XX|  |XX|
+--+  +--+--+--+  +--+--+--+  +--+  +--+--+  +
|XX   |XX XX XX|  |XX XX|   XX|XX XX|XX XX|XX|
+--+--+--+  +--+  +  +--+--+  +  +--+--+--+--+
|  |XX XX    XX|     |XX|  |  |XX XX|  |XX XX|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX|XX   |XX XX|  |XX XX XX|  |  |XX   |  |XX|
+--+  +--+--+--+  +--+--+  +--+  +--+--+  +  +
|XX|XX|  |XX XX|XX|XX|  |XX|XX|     |XX XX|XX|
+  +--+--+--+  +--+  +  +--+  +  +  +--+  +  +
|XX   |XX XX   |XX|  |XX|XX|XX|  |XX|  |XX|  |
+--+--+--+--+--+  +  +--+  +--+--+  +  +--+  +
|  |XX XX XX|XX       XX XX|XX XX|XX|XX|  |XX|
+--+--+--+--+--+--+--+  +  +  +--+  +  +--+--+
|XX    XX XX    XX XX|  |XX|  |XX|XX|XX|XX XX|
+  +--+  +--+  +--+--+--+--+--+--+  +--+  +--+
|  |XX XX XX|  |XX|XX XX XX XX|XX XX|XX|XX   |
+  +--+--+--+--+  +--+  +--+--+--+--+  +--+--+
|  |XX XX XX XX XX|  |XX|XX XX XX|XX|  |XX XX|
+  +--+  +--+--+  +--+--+--+--+--+  +--+--+--+
|XX|  |XX|  |XX|XX|  |XX|XX|  |  |   XX|XX XX|
+--+--+--+  +--+--+--+--+--+--+  +  +--+  +  +
|  |  |  |  |XX|  |  |  |  |XX XX|XX XX|XX|XX|
+  +--+  +  +  +--+--+--+  +--+--+--+--+--+--+
|  |XX|XX|  |  |XX   |XX XX|XX   |XX|  |XX XX|
+  +  +--+  +--+  +--+--+--+--+  +  +--+--+--+
|XX|  |  |XX   |XX|XX|  |XX|XX|XX|   XX XX|XX|
+--+--+--+--+--+--+--+  +--+--+--+--+--+--+  +
|XX|XX|     |XX   |XX XX|XX XX    XX XX|XX XX|
+--+  +--+--+--+--+--+--+--+--+  +--+  +--+  +
|XX XX|   XX|XX|XX    XX|XX|  |   XX|XX|XX|XX|
+--+--+  +--+--+--+--+  +  +--+--+--+--+--+--+
|  |  |XX XX|XX|XX|  |XX|XX|  |  |XX|XX|  |  |
+--+--+--+--+  +--+--+--+--+--+  +  +  +  +--+
|XX XX         |XX|XX|XX    XX|XX|XX   |XX|  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX XX|XX|   XX|XX|XX   |  |XX|XX|  |XX|   XX|
+--+  +--+--+  +--+--+--+--+--+--+--+--+--+--+
|     |XX|  |XX|XX|XX|  |  |  |XX|XX    XX|XX|
+--+--+--+  +--+  +  +--+--+--+--+  +--+  +  +
|  |XX|XX XX|   XX|XX|XX XX    XX|XX XX|XX|XX|
+--+--+--+--+  +--+--+--+--+--+  +  +  +  +--+
|   XX|  |XX      |XX|  |  |XX|XX|XX|XX|XX|  |
+--+--+  +  +--+--+  +--+  +  +  +--+--+--+  +
|XX   |  |XX|   XX|XX|XX|  |XX|XX|  |  |XX XX|
+--+  +--+--+--+--+--+--+--+  +  +  +--+--+--+
|XX|XX XX|XX|XX|XX    XX|   XX|XX|XX|  |XX|XX|
+--+  +--+  +--+--+--+--+  +  +--+--+--+  +  +
|  |XX XX|XX|XX   |XX XX XX|XX XX XX|   XX|XX|
+--+--+  +  +--+--+  +--+  +--+  +--+  +--+--+
|      XX   |XX   |XX|  |XX|   XX|XX|     |  |
+--+--+  +--+--+--+--+  +--+--+--+--+--+--+--+
|XX XX XX|XX|XX|XX|  |XX|XX XX|XX    XX|  |  |
+--+--+--+--+  +--+--+  +--+--+--+--+  +  +  +
|   XX XX|XX|XX   |  |XX|XX XX   |XX XX|XX|XX|
+  +  +  +--+--+  +--+--+--+--+  +--+--+--+--+
|XX|XX|XX XX|XX|XX|XX|XX|XX   |XX XX    XX XX|
+  +  +--+--+--+--+  +  +--+  +  +--+  +--+--+
|XX|XX|XX|XX|XX|XX|  |XX XX|XX|XX XX|XX|  |  |
+--+--+  +--+  +--+  +  +--+--+--+--+--+--+--+
|  |XX   |  |   XX XX|XX XX XX|XX|XX XX XX XX|
+--+--+  +--+  +--+  +--+--+--+  +  +--+--+--+
|XX XX|XX|XX|XX|  |XX|   XX    XX|   XX|   XX|
+  +--+--+  +--+--+--+--+--+--+--+--+--+--+  +
|XX|XX XX|  |XX|XX    XX|XX XX|XX   |   XX|  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|  |XX|XX   |  |  |XX|XX   |  |   XX|XX XX|  |
+--+  +--+--+  +--+  +--+--+  +  +--+--+  +--+
|XX|XX XX|XX|XX|  |  |XX|XX|  |  |XX|  |   XX|
+--+  +--+  +  +  +--+--+  +  +  +  +--+--+  +
|XX|XX XX|  |  |XX XX XX|XX|XX|XX|   XX|XX   |
+  +  +--+--+--+--+  +  +  +--+--+  +--+--+  +
|XX   |  |XX XX|  |XX|XX   |XX   |XX|  |XX XX|
+--+  +--+  +--+--+--+  +--+--+  +  +--+--+  +
|        |XX|   XX|XX   |XX|XX XX|XX|   XX|XX|
+--+--+  +--+  +--+--+  +--+--+--+  +  +--+  +
|XX|   XX|  |  |XX    XX|XX|XX   |XX|XX|  |XX|
+  +--+  +--+--+  +--+--+--+--+--+--+  +--+  +
|   XX|  |XX|XX XX XX|XX XX XX|XX    XX|XX|XX|
+--+--+--+  +--+  +--+--+  +--+--+  +--+  +  +
|XX|XX|XX|XX|XX|  |XX XX   |XX|XX XX|XX|XX|XX|
+--+--+  +--+  +  +--+  +--+  +  +  +  +--+--+
|XX XX|              |  |  |  |XX|XX|XX XX XX|
+  +--+  +--+--+  +  +--+--+--+--+  +--+  +--+
|XX|     |XX   |XX|XX|XX|XX XX   |XX XX|XX XX|
+--+  +--+--+  +  +  +  +  +  +--+--+--+--+--+
|   XX XX XX|XX|XX|  |   XX|XX XX|  |XX|   XX|
+--+--+  +  +--+--+  +--+  +--+  +  +--+  +--+
|XX|XX XX|  |XX   |  |  |XX|     |XX XX|XX   |
+  +--+--+--+--+--+  +  +--+--+  +--+--+  +--+
|  |XX XX|  |XX|     |XX|XX XX|XX|XX XX|XX XX|
+  +--+--+--+--+  +  +--+  +--+--+--+  +--+  +
|XX|XX   |XX XX XX|  |  |XX XX XX|   XX   |XX|
+--+--+--+--+  +--+  +--+--+  +--+--+  +--+--+
|   XX|XX XX|XX|XX       XX|  |  |XX XX|  |XX|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|  |XX XX XX|XX|XX XX|  |  |XX|XX|  |   XX|XX|
+--+--+--+  +--+--+  +--+  +--+--+  +  +--+  +
|XX|  |XX|  |  |XX|  |XX|XX   |   XX         |
+  +  +  +  +--+--+  +  +  +--+  +--+  +  +--+
|  |XX|   XX|XX|XX XX|  |XX|XX|XX   |XX|  |XX|
+--+--+--+  +--+--+--+--+--+  +--+  +--+  +--+
|  |XX|XX|XX|XX XX|XX   |XX XX XX XX   |  |  |
+--+--+--+--+--+--+  +  +--+--+  +--+  +--+--+
|XX|XX|XX|XX   |  |XX|     |XX|XX XX|  |XX|  |
+--+--+  +  +--+--+--+--+--+  +  +--+  +  +--+
|  |XX|XX|XX|XX|XX|XX|XX|        |XX XX    XX|
+--+--+--+--+--+  +--+  +  +  +  +--+  +  +--+
|XX|XX|XX|XX    XX XX    XX|  |XX|XX|  |XX|XX|
+--+  +--+--+  +--+--+  +  +  +--+--+  +--+  +
|  |XX XX XX|  |XX|   XX|XX|XX|XX   |XX|  |  |
+--+--+  +--+--+--+--+--+--+--+--+--+--+  +--+
|XX XX   |  |XX|  |XX|XX|  |XX|  |  |  |XX XX|
+--+--+--+  +--+  +  +--+  +--+--+--+--+  +--+
|  |XX|XX|XX|     |XX XX|XX|  |XX   |  |XX|  |
+--+--+--+  +--+  +--+--+--+--+  +--+--+--+  +
|XX|  |  |   XX|XX|  |XX|XX XX|XX|  |XX   |XX|
+--+--+--+--+--+--+--+--+--+  +--+  +  +--+--+
|XX|XX|  |XX|  |XX XX XX XX|XX|XX|XX|XX XX|XX|
+  +  +--+--+  +--+--+--+--+--+--+--+  +--+--+
|  |XX    XX|XX|XX|XX|  |  |XX   |  |  |XX|  |
+--+--+  +  +--+  +--+--+  +--+  +--+  +  +--+
|XX|XX XX|XX|XX|XX|XX|XX|XX XX|XX|XX|XX|XX   |
+  +--+--+--+  +--+--+--+--+--+--+--+--+  +  +
|  |XX   |   XX|  |XX|XX|XX XX|  |  |XX XX|XX|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX|XX|  |XX|XX XX|XX|XX|XX XX|  |XX|XX|     |
+  +  +--+  +--+  +  +  +--+--+--+--+--+  +--+
|XX   |XX|XX|XX    XX XX|XX|XX|   XX|XX|  |  |
+  +  +  +--+  +  +--+  +  +--+--+--+  +--+  +
|XX|XX|  |     |  |   XX XX    XX   |XX|  |  |
+  +--+--+  +  +  +  +--+--+--+  +--+--+--+  +
|   XX XX|XX|  |XX|  |   XX|XX XX|XX   |XX|XX|
+  +--+--+  +--+--+  +--+--+  +--+--+--+--+--+
|XX XX|XX|XX|XX|   XX|XX|XX|XX|  |XX    XX|XX|
+  +--+  +--+  +--+--+--+--+--+--+  +--+--+  +
|  |XX|  |     |  |XX    XX|XX|  |XX|  |     |
+--+  +--+--+--+--+  +--+--+--+  +--+  +  +--+
|XX|   XX|  |XX XX|XX|XX|     |     |XX|   XX|
+  +--+--+  +--+  +--+--+  +  +--+  +  +  +--+
|XX   |XX|XX|XX|XX|XX XX|XX|XX|   XX|XX|   XX|
+--+  +  +--+--+--+  +--+--+--+  +  +  +--+  +
|XX|XX|XX|XX XX|XX|XX|   XX XX   |  |XX|  |  |
+  +--+--+--+--+--+--+  +  +  +--+  +  +  +  +
|XX      |XX XX|  |  |XX|  |XX XX|  |XX   |XX|
+--+--+--+--+  +--+  +--+--+  +--+  +--+  +--+
|XX|XX   |XX|   XX|   XX|XX|XX XX|XX XX|     |
+  +--+--+--+  +  +  +--+  +  +--+--+  +  +--+
|   XX|   XX|  |XX|XX XX|XX|XX|XX|XX|XX|XX   |
+  +--+  +--+  +--+--+--+  +  +  +  +--+  +--+
|XX|  |   XX|XX XX XX|XX XX XX|XX   |XX|XX   |
+  +--+  +--+--+--+  +  +--+  +--+--+--+--+  +
|XX|  |XX|XX      |XX|XX|  |XX|XX   |  |XX XX|
+--+--+--+--+--+  +--+--+--+--+--+--+--+--+--+
|  |XX XX   |XX XX|  |   XX|  |XX   |XX   |  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX    XX|  |  |  |XX|XX    XX|XX|  |     |XX|
+--+  +--+--+--+--+  +--+--+  +  +--+--+--+--+
|XX|XX|XX|XX|XX    XX|  |XX|  |   XX XX|XX|XX|
+  +  +  +  +--+--+--+  +  +  +  +--+--+--+--+
|   XX XX XX|XX|XX|XX|XX XX   |XX|   XX|XX|  |
+--+  +--+  +--+--+--+--+  +  +--+--+--+--+--+
|XX|  |XX|XX|XX|  |XX|XX|  |XX XX|   XX XX|  |
+--+  +  +  +  +--+--+  +  +  +--+--+--+  +--+
|  |XX|XX XX|XX|   XX|XX|XX|XX|      XX|  |  |
+--+--+  +--+--+  +  +--+--+--+--+  +--+--+--+
|XX|XX XX|XX|XX|XX|XX|XX XX|   XX|XX|XX|XX|XX|
+--+--+  +--+--+--+  +  +--+--+--+--+--+--+--+
|XX    XX XX XX|XX XX|XX|XX|XX|XX|XX|        |
+--+--+--+  +--+  +--+  +  +  +--+--+--+--+--+
|   XX|XX|XX|  |XX|XX XX|XX|XX|XX XX|  |XX|XX|
+--+  +  +--+  +--+--+--+--+--+--+--+--+--+  +
|  |  |XX XX XX XX|  |XX|  |XX XX|   XX|XX|  |
+--+  +--+--+  +--+--+--+--+--+--+--+--+--+  +
|XX XX|XX|XX XX|XX|     |XX|XX|      XX|XX|XX|
+  +  +--+--+  +--+--+--+  +  +--+  +--+--+--+
|XX|   XX XX      |XX|XX XX|  |  |   XX|XX|XX|
+  +--+  +--+--+--+  +--+--+--+--+  +--+--+--+
|XX XX|   XX|XX|  |XX|XX XX|XX   |XX XX XX|XX|
+  +--+--+--+  +  +  +--+  +--+--+  +--+--+--+
|  |XX XX XX|XX|XX|XX XX|XX XX XX|XX|XX XX   |
+  +--+--+--+--+--+  +--+  +--+  +  +--+--+  +
|   XX XX|XX   |XX|XX|XX XX|XX   |  |XX|XX|XX|
+  +--+--+  +--+--+--+--+  +  +--+  +  +  +  +
|  |XX    XX XX   |   XX|XX|XX|  |XX|XX XX   |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|  |XX|XX XX|XX XX|XX XX|  |XX    XX   |XX|XX|
+  +--+--+  +--+  +--+  +--+--+--+  +  +--+  +
|XX|  |   XX    XX XX|  |  |XX|XX|XX|  |  |XX|
+--+--+--+--+  +  +--+--+--+--+--+--+--+  +  +
|  |XX|XX XX|XX|XX|XX XX    XX|  |  |   XX   |
+--+  +  +  +--+--+--+--+--+  +--+--+--+  +  +
|   XX|XX|XX      |XX      |XX|XX|XX|XX XX|  |
+  +--+  +--+  +--+--+  +  +--+  +--+--+--+  +
|  |XX|XX|     |XX|  |  |XX|  |XX|  |  |XX|  |
+--+  +  +--+--+  +--+--+  +  +  +--+--+--+  +
|XX XX|XX|XX XX   |     |  |  |     |XX XX|  |
+--+  +--+  +  +--+--+--+--+--+  +  +--+  +--+
|XX|  |XX|XX|XX|XX      |XX XX XX|XX|XX|  |XX|
+  +--+  +  +--+--+  +--+  +  +  +  +--+  +--+
|XX    XX|  |XX|XX XX|XX   |XX|  |XX|XX    XX|
+  +--+--+--+--+--+--+  +  +--+--+--+--+  +--+
|XX|     |   XX|XX|  |XX|XX|XX|XX|  |  |  |  |
+--+--+  +  +  +  +--+--+  +  +  +--+--+  +  +
|   XX|XX|  |XX XX|XX|XX|XX|XX|XX|XX|  |  |XX|
+--+  +--+--+  +--+--+  +--+  +--+--+--+  +--+
|   XX XX|     |XX|  |XX|  |XX   |     |XX|XX|
+  +--+--+--+  +--+--+--+--+--+--+  +  +  +  +
|XX|XX|  |  |XX|  |  |XX   |XX   |XX|XX|XX|XX|
+--+  +--+--+  +--+--+--+--+--+  +--+  +--+  +
|  |XX      |  |XX XX    XX|XX XX XX|XX|XX   |
+--+--+--+  +  +--+--+--+--+--+  +--+--+--+--+
|   XX XX|XX|XX XX|XX   |XX    XX|XX|  |XX   |
+--+  +--+  +  +--+--+--+--+--+  +--+--+--+  +
|XX|XX|  |XX|XX|XX|  |   XX XX|XX XX|XX   |  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|XX XX    XX XX|XX XX|XX|  |  |     |XX   |  |
+  +--+--+--+  +  +--+  +--+  +--+--+--+--+--+
|  |  |  |XX    XX XX|     |XX|XX|XX XX|     |
+--+  +  +--+  +--+--+--+--+--+  +--+--+--+--+
|  |XX|   XX|  |XX|XX|   XX|XX XX   |     |XX|
+--+--+  +  +  +  +  +--+--+--+--+  +  +--+--+
|  |   XX|XX|XX|XX|   XX|XX XX|  |XX|XX|  |XX|
+--+  +--+--+--+--+--+--+  +--+--+--+--+--+--+
|  |XX|  |XX|  |  |XX   |XX|XX   |XX XX XX|  |
+--+--+--+  +--+--+--+--+--+--+--+--+  +--+--+
|  |XX|   XX|  |XX|XX|XX XX|  |  |  |XX|XX|XX|
+--+  +--+  +--+--+--+  +--+  +--+--+--+  +--+
|XX    XX|XX|XX    XX|  |XX XX    XX XX|  |  |
+--+--+--+--+--+--+--+  +--+--+--+--+  +--+--+
|XX|XX|  |XX|XX XX XX   |XX|  |  |  |XX|XX XX|
+  +--+--+--+  +--+  +--+--+--+  +--+--+--+--+
|     |XX|XX|XX|XX|XX|XX|XX|  |XX|  |XX XX|XX|
+--+--+  +--+--+  +--+  +  +--+  +--+  +--+  +
|XX|XX XX|XX|  |XX       XX    XX XX|  |XX|  |
+--+--+  +--+  +--+--+  +  +--+  +--+--+--+--+
|XX|XX XX|XX|   XX|XX   |XX|XX XX|  |   XX   |
+  +--+--+--+--+--+--+--+--+--+  +--+--+--+--+
|XX|   XX|XX XX XX XX XX XX|  |   XX   |XX|  |
+--+--+--+--+--+  +--+--+  +--+  +--+  +  +  +
|XX|XX|XX|XX   |XX|XX       XX   |XX|XX|XX   |
+--+  +--+  +  +--+--+  +  +--+--+  +--+--+--+
|   XX XX|  |XX|  |  |XX|XX|XX|XX|XX XX|XX|XX|
+  +--+--+--+--+  +--+  +--+--+  +  +--+  +--+
|XX|XX XX|XX    XX XX XX|   XX|   XX XX XX|XX|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|           |           |  |     |     |     |
+--+--+--+--+--+--+--+  +--+--+  +--+--+--+--+
|  |     |  |  |  |     |     |  |  |  |  |  |
+--+--+--+  +--+  +--+--+--+  +  +  +  +--+--+
|  |     |           |  |  |  |  |  |  |     |
+--+--+  +--+--+--+--+--+  +  +  +  +  +--+--+
|  |  |  |     |  |  |  |  |  |  |  |     |  |
+--+  +--+--+  +  +--+  +  +--+--+  +  +  +  +
|  |  |  |     |        |  |  |  |  |  |  |  |
+--+--+  +--+  +--+  +  +  +  +--+--+--+--+--+
|  |     |  |     |  |  |     |  |        |  |
+  +--+--+  +--+--+  +--+--+--+--+--+--+--+  +
|     |  |        |  |     |     |           |
+  +--+  +  +--+  +--+--+--+--+--+--+  +  +  +
|  |        |  |  |     |  |        |  |  |  |
+--+--+--+--+  +--+--+  +  +--+  +--+--+--+  +
|  |  |        |     |  |     |  |     |     |
+--+  +--+--+  +--+  +--+--+  +--+--+--+--+--+
|        |  |     |  |  |        |        |  |
+  +--+--+  +--+--+--+--+--+  +--+--+--+--+--+
|     |           |     |     |     |  |     |
+--+--+--+  +--+--+--+--+--+--+--+--+--+--+--+
|        |     |  |     |  |        |     |  |
+--+--+--+--+--+  +  +  +  +  +--+--+--+  +--+
|     |     |  |     |  |  |  |  |  |     |  |
+--+  +--+  +  +--+--+--+  +--+  +  +--+  +  +
|     |     |  |  |        |           |  |  |
+--+  +  +--+--+--+  +--+  +--+  +  +--+--+  +
| b   |     |  |        |  |     |        |  |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+


From a to b takes 82 steps.