a-a a-b a-c aaa aab aac aak aam aas aau ab- aba abb abc abk abm abs abu ac- aca acb acc ack acm acs acu aka akb akc akk akm aks aku ama amb amc amk amm ams amu as- asa asb asc ask asm ass asu au- aua aub auc auk aum aus b-u baa bab bac bak bam bas bau bba bbb bbc bbk bbm bbs bbu bca bcb bcc bck bcm bcs bcu bka bkb bkc bkk bkm bks bma bmb bmc bmk bmm bms bmu bsa bsb bsc bsk bsm bss bsu bua bub buc buk bum bus buu c-- caa cab cac cak cam cas cau cba cbb cbc cbk cbm cbs cbu cca ccb ccc cck ccm ccs ccu cka ckb ckc ckm cks cma cmb cmc cmk cmm cms cmu csa csb csc csk csm css csu cua cub cuc cuk cum cus cuu ka- kaa kab kac kak kam kas kau kba kbb kbc kbk kbm kbs kbu kca kcb kcc kck kcm kcs kcu kkb kkc kkk kkm kks kku kma kmb kmc kmk kmm kms kmu ksa ksb ksc ksk ksm kss ksu kub kuc kuk kum kus kuu maa mab mac mak mam mas mau mba mbb mbc mbk mbm mbs mbu mc- mca mcb mcc mck mcm mcs mcu mka mkb mkc mkk mkm mks mku mma mmb mmc mmk mmm mms mmu msa msb msc msk msm mss msu mua mub muc muk mum mus muu saa sab sac sak sam sas sau sba sbb sbc sbk sbm sbs sbu sca scb scc sck scm scs scu sk- ska skb skc skk skm sks sku sma smb smc smk smm sms smu ss- ssa ssb ssc ssk ssm sss ssu sua sub suc suk sum sus suu ua- uaa uab uac uak uam uas uau uba ubb ubc ubk ubs ubu uca ucb ucc uck ucm ucs ucu uka ukb ukc ukk uku um- uma umb umc umm ums umu usa usb usc usk usm uss usu uua uuc uum uus uuu