a-a a-c aaa aac aad aaf aao aar aau ac- aca acc acd acf aco acr acu ad- ada adc add adf ado adr adu af- afa afc afd aff afo afr afu aoa aoc aod aof aoo aor aou ar- ara arc ard arf aro arr aru au- aua auc aud auf auo aur c-- caa cac cad caf cao car cau cca ccc ccd ccf cco ccr ccu cda cdc cdd cdf cdo cdr cdu cfa cfc cfd cff cfo cfr cfu co- coa coc cod cof coo cor cou cra crc crd crf cro crr cru cua cuc cud cuf cuo cur cuu daa dac dad daf dao dar dau dca dcc dcd dcf dco dcr dcu dda ddc ddd ddf ddo ddr ddu dfa dfc dfd dff dfo dfr dfu doa doc dod dof doo dor dou dra drc drd dro drr dru dua duc dud duf duo dur faa fac fad faf fao far fau fca fcc fcd fcf fco fcr fcu fda fdc fdd fdf fdo fdr fdu ffa ffc ffd fff ffo ffr ffu foa foc fof foo for fou fra frc frd frf fro frr fru fua fud fuf fuo fur fuu oaa oac oad oaf oao oar oau oc- oca occ ocd ocf oco ocr ocu oda odc odd odf odo odr odu of- ofa ofc ofd off ofo ofr ofu oo- ooa ooc ood oof ooo oor or- ora orc ord orf oro orr oru ou- oua ouc oud ouf ouo our ra- raa rac rad raf rao rar rau rca rcc rcd rcf rco rcr rcu rda rdc rdd rdf rdo rdr rdu rfa rfc rfd rff rfo rfr rfu roa roc rod rof roo ror rou rra rrc rrd rrf rrr rru rua ruc rud ruf ruo rur ruu ua- uaa uac uad uaf uao uar uau uca ucc ucd ucf uco ucr ucu uda udc udd udf udo udr udu ufa ufc ufd uff ufo ufr ufu uoa uoc uod uoo uor ur- ura urc urd urf uro urr uru uua uuc uur uuu