-er a-a aaa aae aaf aak aan aao aar aea aee aef aek aen aeo aer af- afa afe aff afk afn afo afr aka ake akk akn ako akr an- ana ane anf ank ann ano anr aoa aoe aof aok aon aoo aor ar- ara are arf ark arn aro arr eaa eae eaf eak ean eao ear eea eee eef eek een eeo eer ef- efa efe eff efo efr eka eke ekf eko ekr en- ena ene enf enk enn eno enr eo- eoa eoe eof eok eon eoo eor era ere erf erk ern ero err faa fae faf fak fan fao far fea fee fef fek fen feo fer ffa ffe fff ffk ffn ffo ffr fka fkf fkk fna fne fnf fnk fnn fnr foa foe fof fok fon foo for fra fre frf frk frn fro frr ka- kaa kae kaf kak kan kao kar ke- kea kee kef kek ken keo ker kfa kff kfo kke kkk kkn kkr kn- kna kne knf knk knn kno knr koa koe kof kok kon koo kor kra krf krk krn kro krr naa nae naf nak nan nao nar ne- nea nee nef nek nen neo ner nfa nfe nff nfk nfn nfo nfr nka nke nkf nkk nkn nko nkr nna nne nnf nnk nnn nno no- noa noe nof nok non noo nor nra nre nrf nrk nrn nro nrr oaa oae oaf oak oan oao oar oea oee oef oen oeo oer of- ofa ofe off ofn ofo ofr oka oke okk oko okr on- ona one onf onk onn ono onr oo- ooa oof ook oon ooo oor or- ora ore orf ork orn oro orr ra- raa rae raf rak ran rao rar re- rea ree ref rek ren reo rer rfa rfe rff rfk rfn rfo rfr rke rkf rkk rko rna rnn rno rnr roa roe rof rok ron roo ror rra rrf rrk rrn rrr