-er a-a a-c aaa aac aad aae aaf aao aar ac- aca acc acd ace acf aco acr ad- ada adc add ade adf ado adr aea aec aed aee aef aeo aer af- afa afc afd afe aff afo afr aoa aoc aod aoe aof aoo aor ar- ara arc ard are arf aro arr c-- caa cac cad cae caf cao car cca ccc ccd cce ccf cco ccr cda cdc cdd cde cdf cdo cdr ce- cea cec ced cee cef ceo cer cfa cfc cfd cfe cff cfo cfr co- coa coc cod coe cof coo cor cra crc crd cre crf cro crr daa dac dad dae daf dao dar dca dcc dcd dce dcf dco dcr dda ddc ddd dde ddf ddo ddr de- dea dec ded dee def deo der dfa dfc dfd dfe dff dfo dfr doa doc dod doe dof doo dor dra drc drd dre dro drr eaa eac ead eae eaf eao ear ec- eca ecc ecd ece ecf eco ecr ed- eda edc edd ede edf edo edr eea eec eed eee eef eeo eer ef- efa efc efd efe eff efo efr eo- eoa eoc eod eoe eof eoo eor era erc erd ere erf ero err faa fac fad fae faf fao far fca fcc fcd fce fcf fco fcr fda fdc fdd fde fdf fdo fdr fea fec fed fee fef feo fer ffa ffc ffd ffe fff ffo ffr foa foc foe fof foo for fra frc frd fre frf fro frr oaa oac oad oae oaf oao oar oc- oca occ ocd ocf oco ocr oda odc odd ode odf odo odr oea oec oed oee oef oeo oer of- ofa ofc ofd ofe off ofo ofr oo- ooa ooc ood oof ooo oor or- ora orc ord ore orf oro orr ra- raa rac rad rae raf rao rar rca rcc rcd rce rcf rco rcr rda rdc rdd rde rdf rdo rdr re- rea rec red ree ref reo rer rfa rfc rfd rfe rff rfo rfr roa roc rod roe rof roo ror rra rrc rrd rrf rrr