a-a a-b a-c aaa aab aac aad aah aak aar aas ab- aba abb abc abd abh abk abr abs ac- aca acb acc acd ach ack acr acs ad- ada adb adc add adh adk adr ads aha ahb ahc ahd ahh ahk ahr ahs aka akb akc akd akh akk akr aks ar- ara arb arc ard arh ark arr ars as- asa asb asc asd ash ask asr ass baa bab bac bad bah bak bar bas bba bbb bbc bbd bbh bbk bbr bbs bca bcb bcc bcd bch bck bcr bcs bda bdb bdc bdd bdh bdk bdr bds bha bhb bhc bhd bhh bhk bhr bhs bka bkb bkc bkk bkr bks bra brb brd brh brk brr brs bsa bsb bsc bsd bsh bsk bsr bss c-- caa cab cac cad cah cak car cas cba cbb cbc cbd cbh cbk cbr cbs cca ccb ccc ccd cch cck ccr ccs cda cdb cdc cdd cdh cdk cdr cds ch- cha chb chc chd chh chk chr chs cka ckb ckc ckd ckh cks cra crb crc crd crh crk crr crs csa csb csc csd csh csk csr css daa dab dac dad dah dak dar das dba dbb dbc dbd dbh dbk dbr dbs dca dcb dcc dcd dck dcr dcs dda ddb ddc ddd ddh ddk ddr dds dh- dha dhb dhc dhd dhh dhk dhr dhs dka dkb dkc dkk dkr dks dra drb drc drd drk drr drs dsa dsb dsc dsd dsh dsk dsr dss haa hab hac had hah hak har has hba hbb hbc hbd hbh hbk hbr hbs hca hcb hcc hcd hch hck hcr hcs hda hdb hdc hdd hdh hdk hdr hds hha hhb hhc hhd hhh hhk hhr hhs hka hkb hkd hkh hkk hkr hks hr- hra hrb hrc hrd hrh hrk hrr hrs hsa hsb hsc hsd hsh hsk hsr hss ka- kaa kab kac kad kah kak kar kas kba kbb kbc kbd kbh kbk kbr kbs kca kcb kcc kcd kch kck kcr kcs kda kdb kdc kdh kdk kdr kds kha khh khk khr khs kkb kkc kkh kkk kkr kks kra krc krd krk krr krs ksa ksb ksc ksd ksh ksk ksr kss ra- raa rab rac rad rah rak rar ras rba rbb rbc rbd rbh rbk rbr rbs rca rcb rcc rcd rch rcr rcs rda rdb rdc rdd rdh rdr rds rh- rha rhb rhc rhd rhh rhr rhs rkb rkc rkk rks rra rrb rrc rrd rrh rrk rrr rrs rsa rsb rsc rsd rsh rsk rsr rss saa sab sac sad sah sak sar sas sba sbb sbc sbd sbh sbk sbr sbs sca scb scc scd sch sck scr scs sda sdb sdc sdd sdh sdk sdr sds sh- sha shb shc shd shh shk shr shs sk- ska skb skc skd skh skk skr sks sr- sra srb src srd srh srk srr srs ss- ssa ssb ssc ssd ssh ssk ssr sss