The following data sets contain the input data that are used in this example:

data edge_data1;
   input i j;
   datalines;
1 2
2 9
3 4
3 5
5 6
6 7
7 9
8 9
;

data edge_data2;
   input i j;
   datalines;
1 4
2 3
4 6
4 7
5 6
6 8
7 8
7 10
9 10
10 11
;