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