a-a a-b a-c aaa aab aac aag aam aas aau ab- aba abb abc abg abm abs abu ac- aca acb acc acg acm acs acu ag- aga agb agc agg agm ags agu ama amb amc amg amm ams amu as- asa asb asc asg asm ass asu au- aua aub auc aug aum aus b-u baa bab bac bag bam bas bau bba bbb bbc bbg bbm bbs bbu bca bcb bcc bcg bcm bcs bcu bga bgb bgc bgg bgm bgs bgu bma bmb bmc bmg bmm bms bmu bsa bsb bsc bsg bsm bss bsu bua bub buc bug bum bus buu c-- caa cab cac cag cam cas cau cba cbb cbc cbg cbm cbs cbu cca ccb ccc ccg ccm ccs ccu cga cgb cgc cgg cgm cgs cgu cma cmb cmc cmg cmm cms cmu csa csb csc csg csm css csu cua cub cuc cug cum cus cuu gaa gab gac gag gam gas gau gba gbc gbg gbm gbs gbu gca gcb gcc gcg gcm gcs gcu gga ggb ggc ggg ggm ggs ggu gma gmb gmc gmg gmm gms gsa gsb gsc gsg gsm gss gsu gu- gua gub guc gug gum gus guu maa mab mac mag mam mas mau mba mbb mbc mbg mbm mbs mbu mc- mca mcb mcc mcg mcm mcs mcu mga mgb mgc mgm mgs mgu mma mmb mmc mmg mmm mms mmu msa msb msc msg msm mss msu mua mub muc mug mum mus muu saa sab sac sag sam sas sau sba sbb sbc sbg sbm sbs sbu sca scb scc scg scm scs scu sga sgb sgc sgg sgm sgs sgu sma smb smc smg smm sms smu ss- ssa ssb ssc ssg ssm sss ssu sua sub suc sug sum sus suu ua- uaa uab uac uag uam uas uau uba ubb ubc ubg ubs ubu uca ucb ucc ucg ucm ucs ucu uga ugb ugc ugg ugm ugs ugu um- uma umb umc umg umm ums umu usa usb usc usg usm uss usu uua uuc uug uum uus uuu