G

B1

B2

B3

B4

B5

B6

B7

B1

1

2

1

2

1/3

2

1

B2

1/2

1

1/2

1

1/2

2

1

B3

1

2

1

1

1/2

3

1/2

B4

1/2

1

1

1

1

2

1

B5

3

2

2

1

1

3

1

B6

1/2

1/2

1/3

1/2

1/3

1

1/2

B7

1

1

2

1

1

2

1