G’

1

2

3

4

5

6

1

0

2

3

+∞

+∞

+∞

2

2

0

3

2

+∞

+∞

3

3

3

0

2

7

+∞

4

+∞

2

2

0

3

2

5

+∞

+∞

7

3

0

3

6

+∞

+∞

+∞

2

3

0