a-a a-b a-c aaa aab aac aah aak aar aas aau ab- aba abb abc abh abk abr abs abu ac- aca acb acc ach ack acr acs acu aha ahb ahc ahh ahk ahr ahs ahu aka akb akc akh akk akr aks aku ar- ara arb arc arh ark arr ars aru as- asa asb asc ash ask asr ass asu au- aua aub auc auh auk aur aus b-u baa bab bac bah bak bar bas bau bba bbb bbc bbh bbk bbr bbs bbu bca bcb bcc bch bck bcr bcs bcu bha bhb bhc bhh bhk bhr bhs bhu bka bkb bkc bkk bkr bks bra brb brh brk brr brs bru bsa bsb bsc bsh bsk bsr bss bsu bua bub buc buh buk bur bus buu c-- caa cab cac cah cak car cas cau cba cbb cbc cbh cbk cbr cbs cbu cca ccb ccc cch cck ccr ccs ccu ch- cha chb chc chh chk chr chs chu cka ckb ckc ckh cks cra crb crc crh crk crr crs cru csa csb csc csh csk csr css csu cua cub cuc cuh cuk cur cus cuu haa hab hac hah hak har has hau hba hbb hbc hbh hbk hbr hbs hbu hca hcb hcc hch hck hcr hcs hha hhb hhc hhh hhk hhr hhs hhu hka hkb hkh hkk hkr hks hku hr- hra hrb hrc hrh hrk hrr hrs hru hsa hsb hsc hsh hsk hsr hss hsu hua hub huc huh huk hur hus huu ka- kaa kab kac kah kak kar kas kau kba kbb kbc kbh kbk kbr kbs kbu kca kcb kcc kch kck kcr kcs kcu kha khh khk khr khs khu kkb kkc kkh kkk kkr kks kku kra krc krk krr krs kru ksa ksb ksc ksh ksk ksr kss ksu kub kuc kuh kuk kur kus kuu ra- raa rab rac rah rak rar ras rau rba rbb rbc rbh rbk rbr rbs rbu rca rcb rcc rch rcr rcs rcu rh- rha rhb rhc rhh rhr rhs rhu rkb rkc rkk rks rku rra rrb rrc rrh rrk rrr rrs rru rsa rsb rsc rsh rsk rsr rss rsu rua rub ruc ruh ruk rur rus ruu saa sab sac sah sak sar sas sau sba sbb sbc sbh sbk sbr sbs sbu sca scb scc sch sck scr scs scu sh- sha shb shc shh shk shr shs shu sk- ska skb skc skh skk skr sks sku sr- sra srb src srh srk srr srs ss- ssa ssb ssc ssh ssk ssr sss ssu sua sub suc suh suk sur sus suu ua- uaa uab uac uah uak uar uas uau uba ubb ubc ubh ubk ubr ubs ubu uca ucb ucc uch uck ucr ucs ucu uha uhb uhc uhh uhr uhs uhu uka ukb ukc ukk ukr uku ur- ura urb urc urk urr urs uru usa usb usc ush usk usr uss usu uua uuc uur uus uuu