B

C

A

B

A

B

B

A

A

B

A

A

D

D

C

B

C

D

B

C

C

D

B

B

A

C

B

C

C

C

C

B

D

D

C

B

C

D

D

D

C

B

D

B

C

A

C

C

D

A

C

A

D

D

D