30
20
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
|                       |       |                           |                       |                   |   |       |   |
+---+   +   +   +---+---+   +   +   +   +   +   +   +   +---+   +---+---+---+---+   +   +   +---+---+---+   +   +---+   +
|       |   |       |       |   |   |   |   |   |   |                       |   |       |       |   |           |       |
+   +   +   +---+---+   +   +---+   +   +   +---+---+---+---+---+   +---+---+   +---+   +   +---+   +---+   +---+   +---+
|   |   |           |   |           |   |   |       |           |               |       |   |               |           |
+   +---+---+---+---+   +   +---+   +   +   +   +---+   +   +---+   +   +---+   +---+---+   +   +   +---+---+   +---+---+
|   |               |   |   |   |   |   |               |   |   |   |       |       |   |       |               |       |
+   +   +   +---+   +   +---+   +---+---+   +---+---+   +---+   +---+   +   +---+---+   +---+---+---+---+---+---+   +   +
|       |       |       |       |               |   |       |   |       |   |           |               |           |   |
+---+   +---+   +---+---+   +   +---+   +---+---+   +   +---+   +---+---+---+   +---+---+---+   +---+---+   +---+---+---+
|       |   |   |   |       |       |       |   |   |       |   |   |           |           |   |   |               |   |
+   +---+   +---+   +   +---+---+---+   +   +   +   +   +---+   +   +---+---+   +---+   +---+   +   +   +---+---+   +   +
|                               |   |   |   |       |           |   |       |       |           |               |       |
+---+   +---+   +---+---+   +---+   +---+---+   +   +---+---+---+   +   +---+   +---+   +   +---+   +---+   +   +---+---+
|           |           |       |               |   |                       |           |   |       |       |           |
+   +   +---+   +   +---+---+---+   +---+   +   +   +---+---+   +   +---+---+   +---+   +---+   +---+---+---+---+---+---+
|   |       |   |               |       |   |   |           |   |       |       |           |               |           |
+   +---+---+   +---+---+   +   +   +---+---+---+---+---+   +   +   +---+   +   +---+---+   +---+   +---+   +   +---+---+
|   |           |           |                   |           |   |   |       |       |   |   |           |               |
+   +   +---+---+   +   +   +   +---+   +---+   +---+   +   +   +   +---+   +   +   +   +---+   +---+   +   +---+---+---+
|   |           |   |   |   |       |       |   |       |       |           |   |                   |   |               |
+   +---+   +   +---+---+---+   +---+---+---+---+   +---+---+---+   +---+   +---+---+---+---+   +---+   +---+---+---+---+
|       |   |   |                               |   |   |           |   |       |       |           |   |       |       |
+---+   +---+---+---+---+   +---+---+   +---+---+---+   +---+   +---+   +   +---+   +---+   +---+   +---+   +   +   +---+
|                   |       |       |       |   |               |   |                   |       |           |           |
+---+---+   +   +   +---+---+   +   +---+---+   +---+---+   +   +   +   +---+---+   +   +---+---+---+---+---+---+---+   +
|           |   |   |           |           |               |       |           |   |                   |           |   |
+---+---+   +---+---+   +---+---+   +---+   +   +---+---+---+   +   +---+---+---+   +---+---+---+---+   +---+---+   +---+
|               |   |   |               |       |           |   |               |               |               |       |
+   +---+   +---+   +   +---+---+---+---+   +---+   +   +   +   +---+   +   +   +   +   +---+---+---+---+   +   +   +   +
|       |   |       |       |   |           |       |   |       |       |   |   |   |       |       |   |   |       |   |
+   +---+---+---+   +---+---+   +---+---+   +---+---+   +   +   +---+   +   +---+---+---+   +   +---+   +---+   +   +---+
|       |       |   |           |               |       |   |   |       |           |       |   |   |       |   |       |
+   +   +   +---+   +   +   +   +   +---+---+   +   +---+   +   +   +   +---+---+---+   +---+   +   +---+   +---+---+---+
|   |               |   |   |   |   |           |       |   |   |   |           |   |               |                   |
+---+   +---+   +---+---+   +   +---+---+   +---+---+---+---+---+---+---+   +---+   +---+   +   +   +   +---+   +---+   +
|           |       |       |           |                   |   |   |       |           |   |   |           |   |   |   |
+   +   +   +---+---+---+   +---+   +---+---+---+   +---+---+   +   +   +   +   +   +---+---+---+---+   +---+---+   +   +
|   |   |   |                   |                       |               |       |                   |               |   |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
