a-a a-b a-c aaa aab aac aad aah aar aas ab- aba abb abc abd abh abr abs ac- aca acb acc acd ach acr acs ad- ada adb adc add adh adr ads aha ahb ahc ahd ahh ahr ahs ar- ara arb arc ard arh arr ars as- asa asb asc asd ash asr ass baa bab bac bad bah bar bas bba bbb bbc bbd bbh bbr bbs bca bcb bcc bcd bch bcr bcs bda bdb bdc bdd bdh bdr bds bha bhb bhc bhd bhh bhr bhs bra brb brd brh brr brs bsa bsb bsc bsd bsh bsr bss c-- caa cab cac cad cah car cas cba cbb cbc cbd cbh cbr cbs cca ccb ccc ccd cch ccr ccs cda cdb cdc cdd cdh cdr cds ch- cha chb chc chd chh chr chs cra crb crc crd crh crr crs csa csb csc csd csh csr css daa dab dac dad dah dar das dba dbb dbc dbd dbh dbr dbs dca dcb dcc dcd dcr dcs dda ddb ddc ddd ddh ddr dds dh- dha dhb dhc dhd dhh dhr dhs dra drb drc drd drr drs dsa dsb dsc dsd dsh dsr dss haa hab hac had hah har has hba hbb hbc hbd hbh hbr hbs hca hcb hcc hcd hch hcr hcs hda hdb hdc hdd hdh hdr hds hha hhb hhc hhd hhh hhr hhs hr- hra hrb hrc hrd hrh hrr hrs hsa hsb hsc hsd hsh hsr hss ra- raa rab rac rad rah rar ras rba rbb rbc rbd rbh rbr rbs rca rcb rcc rcd rch rcr rcs rda rdb rdc rdd rdh rdr rds rh- rha rhb rhc rhd rhh rhr rhs rra rrb rrc rrd rrh rrr rrs rsa rsb rsc rsd rsh rsr rss saa sab sac sad sah sar sas sba sbb sbc sbd sbh sbr sbs sca scb scc scd sch scr scs sda sdb sdc sdd sdh sdr sds sh- sha shb shc shd shh shr shs sr- sra srb src srd srh srr srs ss- ssa ssb ssc ssd ssh ssr sss