A

B

A

C

A

B

C

B

C

A

B

C

B

C

B

C

A

B

A

C

A

B

C

B

C

A

B

C

B

C

B

C

A

B

A

C

A

B

C

B

C

A

B

C

B

C

B

C

A

B