"ghost node" "shared node" "number of elements"
0 1 50
0 2 100
0 3 1
1 0 50
1 2 1
1 3 100
2 0 100
2 1 1
2 3 50
2 4 100
2 5 1
3 0 1
3 1 100
3 2 50
3 4 1
3 5 100
4 2 100
4 3 1
4 5 50
4 6 100
4 7 1
5 2 1
5 3 100
5 4 50
5 6 1
5 7 100
6 4 301
6 5 3
6 7 100
7 4 1
7 5 100
7 6 50
