-er a-a aaa aae aaf aag aak aan aao aar aea aee aef aeg aek aen aeo aer af- afa afe aff afg afk afn afo afr ag- aga age agf agg agk agn ago agr aka ake akg akk akn ako akr an- ana ane anf ang ank ann ano anr aoa aoe aof aog aok aon aoo aor ar- ara are arf arg ark arn aro arr eaa eae eaf eag eak ean eao ear eea eee eef eeg eek een eeo eer ef- efa efe eff efg efo efr ega ege egf egg egn ego egr eka eke ekf ekg eko ekr en- ena ene enf eng enk enn eno enr eo- eoa eoe eof eog eok eon eoo eor era ere erf erg erk ern ero err faa fae faf fag fak fan fao far fea fee fef feg fek fen feo fer ffa ffe fff ffg ffk ffn ffo ffr fga fge fgf fgg fgn fgr fka fkf fkg fkk fna fne fnf fng fnk fnn fnr foa foe fof fog fok fon foo for fra fre frf frg frk frn fro frr gaa gae gaf gag gak gan gao gar ge- gea gee gef geg gek gen geo ger gfa gfe gff gfk gfo gfr gga ggg ggn ggo ggr gka gkn gko gna gne gnf gnn gno gnr goa goe gof gog gok gon goo gor gra gre grf grg grk grn gro grr ka- kaa kae kaf kag kak kan kao kar ke- kea kee kef keg kek ken keo ker kfa kff kfg kfo kga kgf kgo kke kkk kkn kkr kn- kna kne knf kng knk knn kno knr koa koe kof kog kok kon koo kor kra krf krg krk krn kro krr naa nae naf nag nak nan nao nar ne- nea nee nef neg nek nen neo ner nfa nfe nff nfk nfn nfo nfr nga nge ngf ngg ngk ngn ngo nka nke nkf nkk nkn nko nkr nna nne nnf nng nnk nnn nno no- noa noe nof nog nok non noo nor nra nre nrf nrg nrk nrn nro nrr oaa oae oaf oag oak oan oao oar oea oee oef oeg oen oeo oer of- ofa ofe off ofg ofn ofo ofr oga oge ogf ogg ogn ogo oka oke okg okk oko okr on- ona one onf ong onk onn ono onr oo- ooa oof oog ook oon ooo oor or- ora ore orf org ork orn oro orr ra- raa rae raf rag rak ran rao rar re- rea ree ref reg rek ren reo rer rfa rfe rff rfg rfk rfn rfo rfr rga rge rgf rgg rgk rgn rgo rgr rke rkf rkg rkk rko rna rng rnn rno rnr roa roe rof rog rok ron roo ror rra rrf rrg rrk rrn rrr