-er a-a a-c aaa aac aad aae aaf aar aau ac- aca acc acd ace acf acr acu ad- ada adc add ade adf adr adu aea aec aed aee aef aer aeu af- afa afc afd afe aff afr afu ar- ara arc ard are arf arr aru au- aua auc aud aue auf aur c-- caa cac cad cae caf car cau cca ccc ccd cce ccf ccr ccu cda cdc cdd cde cdf cdr cdu ce- cea cec ced cee cef cer ceu cfa cfc cfd cfe cff cfr cfu cra crc crd cre crf crr cru cua cuc cud cue cuf cur cuu daa dac dad dae daf dar dau dca dcc dcd dce dcf dcr dcu dda ddc ddd dde ddf ddr ddu de- dea dec ded dee def der deu dfa dfc dfd dfe dff dfr dfu dra drc drd dre drr dru dua duc dud due duf dur eaa eac ead eae eaf ear eau ec- eca ecc ecd ece ecf ecr ecu ed- eda edc edd ede edf edr edu eea eec eed eee eef eer ef- efa efc efd efe eff efr era erc erd ere erf err eru eu- eua euc eud eue euf eur faa fac fad fae faf far fau fca fcc fcd fce fcf fcr fcu fda fdc fdd fde fdf fdr fdu fea fec fed fee fef fer feu ffa ffc ffd ffe fff ffr ffu fra frc frd fre frf frr fru fua fud fue fuf fur fuu ra- raa rac rad rae raf rar rau rca rcc rcd rce rcf rcr rcu rda rdc rdd rde rdf rdr rdu re- rea rec red ree ref rer reu rfa rfc rfd rfe rff rfr rfu rra rrc rrd rrf rrr rru rua ruc rud rue ruf rur ruu ua- uaa uac uad uae uaf uar uau uca ucc ucd uce ucf ucr ucu uda udc udd ude udf udr udu uea uec ued uee uef uer ufa ufc ufd ufe uff ufr ufu ur- ura urc urd ure urf urr uru uua uuc uue uur uuu