C

 B

D

A

B

A

C

C

C

B

A

C

D

B

C

D

A

B

B

C

D

A

C

B

C

C

C

A

D

C

A

C

C

A

A

C

C

C

D

C

A

C

A

A

V

B

A

A

D

C

D