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