| Activity | Predecessor | Duration (in days) |
| A | - | 4 |
| B | - | 7 |
| C | - | 6 |
| D | AB | 5 |
| E | AB | 7 |
| F | CDE | 6 |
| G | CDE | 5 |
AB
A & B starts from 1st node; They start from same nodes, and they are not repeated, therefore dummy is required from either A to B or B to A
To analyses CDE we need to break this into three pair of CD, DE & CE
CD
DE
CE
NWD diagram
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