-er a-a a-c aaa aac aad aae aar aau ac- aca acc acd ace acr acu ad- ada adc add ade adr adu aea aec aed aee aer aeu ar- ara arc ard are arr aru au- aua auc aud aue aur c-- caa cac cad cae car cau cca ccc ccd cce ccr ccu cda cdc cdd cde cdr cdu ce- cea cec ced cee cer ceu cra crc crd cre crr cru cua cuc cud cue cur cuu daa dac dad dae dar dau dca dcc dcd dce dcr dcu dda ddc ddd dde ddr ddu de- dea dec ded dee der deu dra drc drd dre drr dru dua duc dud due dur eaa eac ead eae ear eau ec- eca ecc ecd ece ecr ecu ed- eda edc edd ede edr edu eea eec eed eee eer era erc erd ere err eru eu- eua euc eud eue eur ra- raa rac rad rae rar rau rca rcc rcd rce rcr rcu rda rdc rdd rde rdr rdu re- rea rec red ree rer reu rra rrc rrd rrr rru rua ruc rud rue rur ruu ua- uaa uac uad uae uar uau uca ucc ucd uce ucr ucu uda udc udd ude udr udu uea uec ued uee uer ur- ura urc urd ure urr uru uua uuc uue uur uuu