-er a-a a-c aaa aac aae aaf aag aao aar aas aau ac- aca acc ace acf acg aco acr acs acu aea aec aee aef aeg aeo aer aes aeu af- afa afc afe aff afg afo afr afs afu ag- aga agc age agf agg ago agr ags agu aoa aoc aoe aof aog aoo aor aos aou ar- ara arc are arf arg aro arr ars aru as- asa asc ase asf asg aso asr ass asu au- aua auc aue auf aug auo aur aus c-- caa cac cae caf cag cao car cas cau cca ccc cce ccf ccg cco ccr ccs ccu ce- cea cec cee cef ceg ceo cer ces ceu cfa cfc cfe cff cfg cfo cfr cfs cfu cga cgc cge cgg cgo cgr cgs cgu co- coa coc coe cof cog coo cor cos cou cra crc cre crf crg cro crr crs cru csa csc cse csf csg cso csr css csu cua cuc cue cuf cug cuo cur cus cuu eaa eac eae eaf eag eao ear eas eau ec- eca ecc ece ecf ecg eco ecr ecs ecu eea eec eee eef eeg eeo eer ees ef- efa efc efe eff efg efo efr efs ega egc ege egf egg ego egr egs egu eo- eoa eoc eoe eof eog eoo eor eos eou era erc ere erf erg ero err ers eru es- esa esc ese esf esg eso esr ess esu eu- eua euc eue euf eug eur eus faa fac fae faf fag fao far fas fau fca fcc fce fcf fcg fco fcr fcs fcu fea fec fee fef feg feo fer fes feu ffa ffc ffe fff ffg ffo ffr ffs ffu fga fgc fge fgf fgg fgr fgs foa foc foe fof fog foo for fos fou fra frc fre frf frg fro frr frs fru fsa fsc fse fsf fsg fso fsr fss fsu fua fue fuf fug fuo fur fus fuu gaa gac gae gaf gag gao gar gas gau gca gcc gce gcf gcg gco gcr gcs gcu ge- gea gec gee gef geg geo ger ges geu gfa gfc gfe gff gfo gfr gfs gga ggc ggg ggo ggr ggs ggu goa goc goe gof gog goo gor gos gou gra grc gre grf grg gro grr grs gru gsa gsc gse gsf gsg gso gsr gss gsu gu- gua guc gue guf gug guo gur gus guu oaa oac oae oaf oag oao oar oas oau oc- oca occ ocf ocg oco ocr ocs ocu oea oec oee oef oeg oeo oer oes of- ofa ofc ofe off ofg ofo ofr ofs ofu oga ogc oge ogf ogg ogo ogs oo- ooa ooc oof oog ooo oor oos or- ora orc ore orf org oro orr ors oru os- osa osc ose osf osg oso osr oss osu ou- oua ouc oue ouf ouo our ous ra- raa rac rae raf rag rao rar ras rau rca rcc rce rcf rcg rco rcr rcs rcu re- rea rec ree ref reg reo rer res reu rfa rfc rfe rff rfg rfo rfr rfs rfu rga rgc rge rgf rgg rgo rgr rgs roa roc roe rof rog roo ror ros rou rra rrc rrf rrg rrr rrs rru rsa rsc rse rsf rsg rso rsr rss rsu rua ruc rue ruf rug ruo rur rus ruu saa sac sae saf sag sao sar sas sau sca scc sce scf scg sco scr scs scu se- sea sec see sef seg seo ser ses seu sfa sfc sfe sff sfg sfo sfr sfs sfu sga sgc sge sgf sgg sgo sgr sgs sgu soa soc soe sof sog soo sor sos sou sr- sra src sre srf srg sro srr srs ss- ssa ssc sse ssf ssg sso ssr sss ssu sua suc sue suf sug suo sur sus suu ua- uaa uac uae uaf uag uao uar uas uau uca ucc uce ucf ucg uco ucr ucs ucu uea uec uee uef ueg uer ues ufa ufc ufe uff ufg ufo ufr ufs ufu uga ugc uge ugf ugg ugo ugr ugs ugu uoa uoc uoe uog uoo uor uos ur- ura urc ure urf urg uro urr urs uru usa usc use usf usg uso usr uss usu uua uuc uue uug uur uus uuu