Draw the graph big and clear AND Find the Minimum Crossing number:

vertices: A B C D E F G H I

Edges:

H C

D B

E F

C A

E D

A E

D I

B C

C E

G F

F A

I E

G C

B E

H B

G D

H I

E G

A H

G H

I B

D H

C F

H E