R5:=Matrix([
[5,2,0,2,0,0],
[5,4,4,0,5,4],
[0,2,4,2,0,0],
[0,0,2,3,2,4],
[0,2,0,2,3,0],
[0,0,0,1,0,2]
]);
Nodes
0 : 1 0 3 2 5 4 7 6 9 8 
1 : 1 0 3 2 5 4 9 8 7 6 
2 : 1 0 3 2 9 6 5 8 7 4 
3 : 1 0 3 2 9 8 7 6 5 4 
4 : 1 0 5 4 3 2 9 8 7 6 
5 : 1 0 9 8 7 6 5 4 3 2