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