□ □
AA BB DD EE GG HH CC FF
_______________________ A1 ________________________ A2 __________________________ B ___________________________ C ___________________________ D
□ □ □ C A1 A2 B A2 A1 DD AA CC GG BB CC DD AA CC GG BB CC
□ □ □ □ □ CC HH DD
□ □ □ □
