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