a-a a-b a-c aaa aab aac aad aah aak aar aas aau ab- aba abb abc abd abh abk abr abs abu ac- aca acb acc acd ach ack acr acs acu ad- ada adb adc add adh adk adr ads adu aha ahb ahc ahd ahh ahk ahr ahs ahu aka akb akc akd akh akk akr aks aku ar- ara arb arc ard arh ark arr ars aru as- asa asb asc asd ash ask asr ass asu au- aua aub auc aud auh auk aur aus b-u baa bab bac bad bah bak bar bas bau bba bbb bbc bbd bbh bbk bbr bbs bbu bca bcb bcc bcd bch bck bcr bcs bcu bda bdb bdc bdd bdh bdk bdr bds bdu bha bhb bhc bhd bhh bhk bhr bhs bhu bka bkb bkc bkk bkr bks bra brb brd brh brk brr brs bru bsa bsb bsc bsd bsh bsk bsr bss bsu bua bub buc bud buh buk bur bus buu c-- caa cab cac cad cah cak car cas cau cba cbb cbc cbd cbh cbk cbr cbs cbu cca ccb ccc ccd cch cck ccr ccs ccu cda cdb cdc cdd cdh cdk cdr cds cdu ch- cha chb chc chd chh chk chr chs chu cka ckb ckc ckd ckh cks cra crb crc crd crh crk crr crs cru csa csb csc csd csh csk csr css csu cua cub cuc cud cuh cuk cur cus cuu daa dab dac dad dah dak dar das dau dba dbb dbc dbd dbh dbk dbr dbs dbu dca dcb dcc dcd dck dcr dcs dcu dda ddb ddc ddd ddh ddk ddr dds ddu dh- dha dhb dhc dhd dhh dhk dhr dhs dhu dka dkb dkc dkk dkr dks dku dra drb drc drd drk drr drs dru dsa dsb dsc dsd dsh dsk dsr dss dsu dua dub duc dud duh duk dur dus haa hab hac had hah hak har has hau hba hbb hbc hbd hbh hbk hbr hbs hbu hca hcb hcc hcd hch hck hcr hcs hda hdb hdc hdd hdh hdk hdr hds hdu hha hhb hhc hhd hhh hhk hhr hhs hhu hka hkb hkd hkh hkk hkr hks hku hr- hra hrb hrc hrd hrh hrk hrr hrs hru hsa hsb hsc hsd hsh hsk hsr hss hsu hua hub huc hud huh huk hur hus huu ka- kaa kab kac kad kah kak kar kas kau kba kbb kbc kbd kbh kbk kbr kbs kbu kca kcb kcc kcd kch kck kcr kcs kcu kda kdb kdc kdh kdk kdr kds kdu kha khh khk khr khs khu kkb kkc kkh kkk kkr kks kku kra krc krd krk krr krs kru ksa ksb ksc ksd ksh ksk ksr kss ksu kub kuc kud kuh kuk kur kus kuu ra- raa rab rac rad rah rak rar ras rau rba rbb rbc rbd rbh rbk rbr rbs rbu rca rcb rcc rcd rch rcr rcs rcu rda rdb rdc rdd rdh rdr rds rdu rh- rha rhb rhc rhd rhh rhr rhs rhu rkb rkc rkk rks rku rra rrb rrc rrd rrh rrk rrr rrs rru rsa rsb rsc rsd rsh rsk rsr rss rsu rua rub ruc rud ruh ruk rur rus ruu saa sab sac sad sah sak sar sas sau sba sbb sbc sbd sbh sbk sbr sbs sbu sca scb scc scd sch sck scr scs scu sda sdb sdc sdd sdh sdk sdr sds sdu sh- sha shb shc shd shh shk shr shs shu sk- ska skb skc skd skh skk skr sks sku sr- sra srb src srd srh srk srr srs ss- ssa ssb ssc ssd ssh ssk ssr sss ssu sua sub suc sud suh suk sur sus suu ua- uaa uab uac uad uah uak uar uas uau uba ubb ubc ubh ubk ubr ubs ubu uca ucb ucc ucd uch uck ucr ucs ucu uda udb udc udd udk udr uds udu uha uhb uhc uhd uhh uhr uhs uhu uka ukb ukc ukk ukr uku ur- ura urb urc urd urk urr urs uru usa usb usc usd ush usk usr uss usu uua uuc uur uus uuu