| Activity | Predecessor |
| A | - |
| B | - |
| C | - |
| D | A |
| E | B |
| F | C |
| G | DE |
| H | FG |
DE
D starts from A & E starts from B; They start from different nodes, and there is no repetition of D or E, therefore heads of D&E should be merged.
FG
F starts from C & G starts from DE;They start from different nodes, and there is no repetition of F or G,therefore heads of F&G should be merged.
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