- arc

[<yasirarfat081 AT gmail.com>]

I have a text file as follows:
1    3
2    5
3    6
4    5
5    4
6    1
7    2
The above file represents the edges in an undirected graph. I want to remove
the duplicate edges in the graph. In the above given example I want to remove
either 4,5 or 5,4 as they represent the same edge in graph and hence causes
duplication. I am trying to visualize the graph from the file using 
Graphstream
using the GraphX library in Apache Spark. But due to the presence of duplicate
nodes as explained above it gives an error as follows:
org.graphstream.graph.EdgeRejectedException: Edge 4[5--4] was rejected by node
5
What would be the best way to remove such duplicates from the text file?