-er a-a aaa aad aae aaf aag aak aao aar ad- ada add ade adf adg adk ado adr aea aed aee aef aeg aek aeo aer af- afa afd afe aff afg afk afo afr ag- aga agd age agf agg agk ago agr aka akd ake akg akk ako akr aoa aod aoe aof aog aok aoo aor ar- ara ard are arf arg ark aro arr daa dad dae daf dag dak dao dar dda ddd dde ddf ddg ddk ddo ddr de- dea ded dee def deg dek deo der dfa dfd dfe dff dfg dfk dfo dfr dga dgd dge dgf dgg dgk dgr dka dke dkg dkk dko dkr doa dod doe dof dog dok doo dor dra drd dre drg drk dro drr eaa ead eae eaf eag eak eao ear ed- eda edd ede edf edg edk edo edr eea eed eee eef eeg eek eeo eer ef- efa efd efe eff efg efo efr ega egd ege egf egg ego egr eka ekd eke ekf ekg eko ekr eo- eoa eod eoe eof eog eok eoo eor era erd ere erf erg erk ero err faa fad fae faf fag fak fao far fda fdd fde fdf fdg fdk fdo fdr fea fed fee fef feg fek feo fer ffa ffd ffe fff ffg ffk ffo ffr fga fgd fge fgf fgg fgr fka fkf fkg fkk foa foe fof fog fok foo for fra frd fre frf frg frk fro frr g-d gaa gad gae gaf gag gak gao gar gda gdd gde gdf gdk gdo gdr ge- gea ged gee gef geg gek geo ger gfa gfd gfe gff gfk gfo gfr gga ggd ggg ggo ggr gka gkd gko goa god goe gof gog gok goo gor gra grd gre grf grg grk gro grr ka- kaa kad kae kaf kag kak kao kar kda kde kdf kdg kdk kdo kdr ke- kea ked kee kef keg kek keo ker kfa kfd kff kfg kfo kga kgd kgf kgo kke kkk kkr koa kod koe kof kog kok koo kor kra krd krf krg krk kro krr oaa oad oae oaf oag oak oao oar oda odd ode odf odg odo odr oea oed oee oef oeg oeo oer of- ofa ofd ofe off ofg ofo ofr oga ogd oge ogf ogg ogo oka okd oke okg okk oko okr oo- ooa ood oof oog ook ooo oor or- ora ord ore orf org ork oro orr ra- raa rad rae raf rag rak rao rar rda rdd rde rdf rdg rdo rdr re- rea red ree ref reg rek reo rer rfa rfd rfe rff rfg rfk rfo rfr rga rgd rge rgf rgg rgk rgo rgr rke rkf rkg rkk rko roa rod roe rof rog rok roo ror rra rrd rrf rrg rrk rrr