1
8
1/2 3/2 -1/1
3/2 3/2 -1/1
3/2 1/2 -1/1
1/2 1/2 -1/1
1/2 1/2 5/1
3/2 1/2 5/1
3/2 3/2 5/1
1/2 3/2 5/1