SECTION 1:BECED　DCBCA　ACCEC　ABABE　ACDA
SECTION 2:ACDDD　BBCBB　BDACB　CCEEB　ADEA
SECTION 3:AEBEA　DDCCE　DBADC　EAEDB　BADCB　AC
SECTION 4:DAEBA　CEEBA　BCEBC　CBCCC　CDDAB　D