Question: duration (days) predecessors A 6 B 7 C 6 D 4 E 7 F 8 G 6 H 5 Please Find predecessors like A, B

|
| duration (days) | predecessors |
| A | 6 |
|
| B | 7 |
|
| C | 6 |
|
| D | 4 |
|
| E | 7 |
|
| F | 8 |
|
| G | 6 |
|
| H | 5 |
|
Please Find predecessors like A, B or none
Thanks in advance
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