4 6 2 4 0

4

3

4 1 1 1 1
1 0 -1
2
0

1 2 2 1 0
2 1 1
0

1 3 1 2 0
1 0 0
2 1 -1
0

2 3 3 1 0
1 0 0
0

3 3 4 1 0
1 2 -1
0

3 1 1 1 1
2 0 0
2
0

http://computerscience.unicam.it/tesei/pubdownload/T04Phd.pdf
fig 2.5
