2 +
| |
+---+---+---+
| |
| +
| |
+---+---+ +
| | | |
+ +---+---+
| | |
+ +---+---+
| | | 4
+---+-+ |/
+
2 = Moria (Part 2) {5-15}
4 = Moria (Part 4) {5-15}
Here is the universal key.