a-a a-b aaa aab aad aah aar aas ab- aba abb abd abh abr abs ad- ada adb add adh adr ads aha ahb ahd ahh ahr ahs ar- ara arb ard arh arr ars as- asa asb asd ash asr ass baa bab bad bah bar bas bba bbb bbd bbh bbr bbs bda bdb bdd bdh bdr bds bha bhb bhd bhh bhr bhs bra brb brd brh brr brs bsa bsb bsd bsh bsr bss daa dab dad dah dar das dba dbb dbd dbh dbr dbs dda ddb ddd ddh ddr dds dh- dha dhb dhd dhh dhr dhs dra drb drd drr drs dsa dsb dsd dsh dsr dss haa hab had hah har has hba hbb hbd hbh hbr hbs hda hdb hdd hdh hdr hds hha hhb hhd hhh hhr hhs hr- hra hrb hrd hrh hrr hrs hsa hsb hsd hsh hsr hss ra- raa rab rad rah rar ras rba rbb rbd rbh rbr rbs rda rdb rdd rdh rdr rds rh- rha rhb rhd rhh rhr rhs rra rrb rrd rrh rrr rrs rsa rsb rsd rsh rsr rss saa sab sad sah sar sas sba sbb sbd sbh sbr sbs sda sdb sdd sdh sdr sds sh- sha shb shd shh shr shs sr- sra srb srd srh srr srs ss- ssa ssb ssd ssh ssr sss