-er a-a a-c aaa aac aae aaf aar aas aau ac- aca acc ace acf acr acs acu aea aec aee aef aer aes aeu af- afa afc afe aff afr afs afu ar- ara arc are arf arr ars aru as- asa asc ase asf asr ass asu au- aua auc aue auf aur aus c-- caa cac cae caf car cas cau cca ccc cce ccf ccr ccs ccu ce- cea cec cee cef cer ces ceu cfa cfc cfe cff cfr cfs cfu cra crc cre crf crr crs cru csa csc cse csf csr css csu cua cuc cue cuf cur cus cuu eaa eac eae eaf ear eas eau ec- eca ecc ece ecf ecr ecs ecu eea eec eee eef eer ees ef- efa efc efe eff efr efs era erc ere erf err ers eru es- esa esc ese esf esr ess esu eu- eua euc eue euf eur eus faa fac fae faf far fas fau fca fcc fce fcf fcr fcs fcu fea fec fee fef fer fes feu ffa ffc ffe fff ffr ffs ffu fra frc fre frf frr frs fru fsa fsc fse fsf fsr fss fsu fua fue fuf fur fus fuu ra- raa rac rae raf rar ras rau rca rcc rce rcf rcr rcs rcu re- rea rec ree ref rer res reu rfa rfc rfe rff rfr rfs rfu rra rrc rrf rrr rrs rru rsa rsc rse rsf rsr rss rsu rua ruc rue ruf rur rus ruu saa sac sae saf sar sas sau sca scc sce scf scr scs scu se- sea sec see sef ser ses seu sfa sfc sfe sff sfr sfs sfu sr- sra src sre srf srr srs ss- ssa ssc sse ssf ssr sss ssu sua suc sue suf sur sus suu ua- uaa uac uae uaf uar uas uau uca ucc uce ucf ucr ucs ucu uea uec uee uef uer ues ufa ufc ufe uff ufr ufs ufu ur- ura urc ure urf urr urs uru usa usc use usf usr uss usu uua uuc uue uur uus uuu