origin	destination	population
1	2	50.0
1	17	50.0
1	3	50.0
1	7	50.0
1	13	50.0
1	12	50.0
1	6	50.0
2	1	50.0
2	17	50.0
2	3	50.0
2	7	50.0
2	13	50.0
2	12	50.0
2	6	50.0
17	1	50.0
17	2	50.0
17	3	50.0
17	7	50.0
17	13	50.0
17	12	50.0
17	6	50.0
3	1	50.0
3	2	50.0
3	17	50.0
3	7	50.0
3	13	50.0
3	12	50.0
3	6	50.0
7	1	50.0
7	2	50.0
7	17	50.0
7	3	50.0
7	13	50.0
7	12	50.0
7	6	50.0
13	1	50.0
13	2	50.0
13	17	50.0
13	3	50.0
13	7	50.0
13	12	50.0
13	6	50.0
12	1	50.0
12	2	50.0
12	17	50.0
12	3	50.0
12	7	50.0
12	13	50.0
12	6	50.0
6	1	50.0
6	2	50.0
6	17	50.0
6	3	50.0
6	7	50.0
6	13	50.0
6	12	50.0