Need to remove duplicate where source or destination can be switched.
Input:
source | destination | distance |
city1 | city2 | 500 |
city2 | city1 | 500 |
city3 | city4 | 500 |
city4 | city3 | 500 |
city5 | city7 | 700 |
city7 | city5 | 700 |
Output:
source | destination | distance |
city1 | city2 | 500 |
city3 | city4 | 500 |
city5 | city7 | 700 |
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