a-a a-b a-c aaa aab aac aah aak aao aar aas aau ab- aba abb abc abh abk abo abr abs abu ac- aca acb acc ach ack aco acr acs acu aha ahb ahc ahh ahk aho ahr ahs ahu aka akb akc akh akk ako akr aks aku aoa aob aoc aoh aok aoo aor aos aou ar- ara arb arc arh ark aro arr ars aru as- asa asb asc ash ask aso asr ass asu au- aua aub auc auh auk auo aur aus b-u baa bab bac bah bak bao bar bas bau bba bbb bbc bbh bbk bbo bbr bbs bbu bca bcb bcc bch bck bco bcr bcs bcu bha bhb bhc bhh bhk bho bhr bhs bhu bka bkb bkc bkk bko bkr bks boa bob boc boh bok boo bor bos bou bra brb brh brk bro brr brs bru bsa bsb bsc bsh bsk bso bsr bss bsu bua bub buc buh buk buo bur bus buu c-- caa cab cac cah cak cao car cas cau cba cbb cbc cbh cbk cbo cbr cbs cbu cca ccb ccc cch cck cco ccr ccs ccu ch- cha chb chc chh chk cho chr chs chu cka ckb ckc ckh cko cks co- coa cob coc coh cok coo cor cos cou cra crb crc crh crk cro crr crs cru csa csb csc csh csk cso csr css csu cua cub cuc cuh cuk cuo cur cus cuu haa hab hac hah hak hao har has hau hba hbb hbc hbh hbk hbo hbr hbs hbu hca hcb hcc hch hck hco hcr hcs hha hhb hhc hhh hhk hho hhr hhs hhu hka hkb hkh hkk hko hkr hks hku hoa hob hoc hoh hok hoo hor hos hou hr- hra hrb hrc hrh hrk hro hrr hrs hru hsa hsb hsc hsh hsk hsr hss hsu hua hub huc huh huk huo hur hus huu ka- kaa kab kac kah kak kao kar kas kau kba kbb kbc kbh kbk kbo kbr kbs kbu kca kcb kcc kch kck kcr kcs kcu kha khh khk kho khr khs khu kkb kkc kkh kkk kkr kks kku koa kob koc koh kok koo kor kos kou kra krc krk kro krr krs kru ksa ksb ksc ksh ksk kso ksr kss ksu kub kuc kuh kuk kur kus kuu oaa oab oac oah oak oao oar oas oau ob- oba obb obc obh obk obo obr obs obu oc- oca ocb occ och ock oco ocr ocs ocu oha ohc ohh oho ohr ohs ohu oka okb okc okk oko okr oks oku oo- ooa oob ooc ooh ook ooo oor oos or- ora orb orc orh ork oro orr ors oru os- osa osb osc osh osk oso osr oss osu ou- oua ouc ouh ouk ouo our ous ra- raa rab rac rah rak rao rar ras rau rba rbb rbc rbh rbk rbo rbr rbs rbu rca rcb rcc rch rco rcr rcs rcu rh- rha rhb rhc rhh rho rhr rhs rhu rkb rkc rkk rko rks rku roa rob roc roh rok roo ror ros rou rra rrb rrc rrh rrk rrr rrs rru rsa rsb rsc rsh rsk rso rsr rss rsu rua rub ruc ruh ruk ruo rur rus ruu saa sab sac sah sak sao sar sas sau sba sbb sbc sbh sbk sbo sbr sbs sbu sca scb scc sch sck sco scr scs scu sh- sha shb shc shh shk sho shr shs shu sk- ska skb skc skh skk sko skr sks sku soa sob soc soh sok soo sor sos sou sr- sra srb src srh srk sro srr srs ss- ssa ssb ssc ssh ssk sso ssr sss ssu sua sub suc suh suk suo sur sus suu ua- uaa uab uac uah uak uao uar uas uau uba ubb ubc ubh ubk ubo ubr ubs ubu uca ucb ucc uch uck uco ucr ucs ucu uha uhb uhc uhh uho uhr uhs uhu uka ukb ukc ukk ukr uku uoa uob uoc uok uoo uor uos ur- ura urb urc urk uro urr urs uru usa usb usc ush usk uso usr uss usu uua uuc uur uus uuu