-er a-a aaa aae aag aak aao aar aea aee aeg aek aeo aer ag- aga age agg agk ago agr aka ake akg akk ako akr aoa aoe aog aok aoo aor ar- ara are arg ark aro arr eaa eae eag eak eao ear eea eee eeg eek eeo eer ega ege egg ego egr eka eke ekg eko ekr eo- eoa eoe eog eok eoo eor era ere erg erk ero err gaa gae gag gak gao gar ge- gea gee geg gek geo ger gga ggg ggo ggr gka gko goa goe gog gok goo gor gra gre grg grk gro grr ka- kaa kae kag kak kao kar ke- kea kee keg kek keo ker kga kgo kke kkk kkr koa koe kog kok koo kor kra krg krk kro krr oaa oae oag oak oao oar oea oee oeg oeo oer oga oge ogg ogo oka oke okg okk oko okr oo- ooa oog ook ooo oor or- ora ore org ork oro orr ra- raa rae rag rak rao rar re- rea ree reg rek reo rer rga rge rgg rgk rgo rgr rke rkg rkk rko roa roe rog rok roo ror rra rrg rrk rrr