30~100答案依次是：
ABDDD
DCADC
DBACC
CBADB
BCCDA
CDADC
CBBCA
CADDB
BDACD
BDDAB
BCBCB
BDDCA
CADDB
ADABA
DDBCA
CDACB
CBACD
AACBB
CACDC
BBCAD
ACACB
BCDCB
CBAAD
BADCB
CCABC
CDADC
DACBD
BAACB
DBDDB
DCCDA
BDBAC
CBCAB
ACBDC
CBADA
DCAAB
CADBC
DACBC
DDACA
CBDCD
BDABB
DCABC
CBAAC
CDADB
BDCBA
BACAC
ACBBD
CCDCC
BACAB
BCBDD
ABDDC
ABBCD
BDCCC
CDDAD
CABDB
BDDAC
DBACA
ADDAB
ABADD
BDADC
CBDAA
DCABD
BCADC
BACAA
CDBCA
AABAD
CCABC
BBCCA
CDCDB
CADDD
BDCAB
DCDCC