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