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