a-a a-b a-c aaa aab aac aak aam aar aas aau ab- aba abb abc abk abm abr abs abu ac- aca acb acc ack acm acr acs acu aka akb akc akk akm akr aks aku ama amb amc amk amm amr ams amu ar- ara arb arc ark arm arr ars aru as- asa asb asc ask asm asr ass asu au- aua aub auc auk aum aur aus b-u baa bab bac bak bam bar bas bau bba bbb bbc bbk bbm bbr bbs bbu bca bcb bcc bck bcm bcr bcs bcu bka bkb bkc bkk bkm bkr bks bma bmb bmc bmk bmm bmr bms bmu bra brb brk brm brr brs bru bsa bsb bsc bsk bsm bsr bss bsu bua bub buc buk bum bur bus buu c-- caa cab cac cak cam car cas cau cba cbb cbc cbk cbm cbr cbs cbu cca ccb ccc cck ccm ccr ccs ccu cka ckb ckc ckm cks cma cmb cmc cmk cmm cmr cms cmu cra crb crc crk crm crr crs cru csa csb csc csk csm csr css csu cua cub cuc cuk cum cur cus cuu ka- kaa kab kac kak kam kar kas kau kba kbb kbc kbk kbm kbr kbs kbu kca kcb kcc kck kcm kcr kcs kcu kkb kkc kkk kkm kkr kks kku kma kmb kmc kmk kmm kms kmu kra krc krk krr krs kru ksa ksb ksc ksk ksm ksr kss ksu kub kuc kuk kum kur kus kuu m-r maa mab mac mak mam mar mas mau mba mbb mbc mbk mbm mbr mbs mbu mc- mca mcb mcc mck mcm mcr mcs mcu mka mkb mkc mkk mkm mkr mks mku mma mmb mmc mmk mmm mmr mms mmu mra mrb mrc mrk mrm mrr mrs mru msa msb msc msk msm msr mss msu mua mub muc muk mum mur mus muu ra- raa rab rac rak ram rar ras rau rba rbb rbc rbk rbm rbr rbs rbu rca rcb rcc rcm rcr rcs rcu rkb rkc rkk rkm rks rku rma rmb rmc rmm rmr rms rra rrb rrc rrk rrm rrr rrs rru rsa rsb rsc rsk rsm rsr rss rsu rua rub ruc ruk rum rur rus ruu saa sab sac sak sam sar sas sau sba sbb sbc sbk sbm sbr sbs sbu sca scb scc sck scm scr scs scu sk- ska skb skc skk skm skr sks sku sma smb smc smk smm smr sms smu sr- sra srb src srk srm srr srs ss- ssa ssb ssc ssk ssm ssr sss ssu sua sub suc suk sum sur sus suu ua- uaa uab uac uak uam uar uas uau uba ubb ubc ubk ubr ubs ubu uca ucb ucc uck ucm ucr ucs ucu uka ukb ukc ukk ukr uku um- uma umb umc umm umr ums umu ur- ura urb urc urk urm urr urs uru usa usb usc usk usm usr uss usu uua uuc uum uur uus uuu