Graph 1 (G1)

X2

X5 X3

X4

X1

Graph 2 (G2)

Y2c

Y3cY1

c

0

2

31

Graph 3 (G3)

0

2

31

Graph 4 (G4)

0

2

31

Graph 5 (G5)

Graph 6 (G6)

0

5

64

231

Graph 7 (G7)Y6

cY4c

Y5c

0

5

64

231

Graph 8 (G8)

0

5

64

231

Graph 10 (G10)

0

5

64

231

Graph 12 (G10)

Graph 9 (G9)

Y5c

Y6cY4

c

Y5c

Y6cY4

c

Graph 11 (G11)

Y5c

Y6cY4

c

Graph 13 (G13)

31

2

40 5

Graph 14 (G14)

1

0 2

Graph 15 (G15)

1

0 3

2

Graph 16 (G16)

2

1 30 4

Graph 17 (G17)

Graph 18 (G18)

75

6

9

4

32 8

1

0

0

4

53

21

Graph 19 (G19)

Y5cY3

c

Y4c

Graph 20 (G20)