a-a a-c aaa aac aaf aak aan aao aar ac- aca acc acf ack acn aco acr af- afa afc aff afk afn afo afr aka akc akk akn ako akr an- ana anc anf ank ann ano anr aoa aoc aof aok aon aoo aor ar- ara arc arf ark arn aro arr c-- caa cac caf cak can cao car cca ccc ccf cck ccn cco ccr cfa cfc cff cfk cfn cfo cfr cka ckc cko cn- cna cnc cnf cnn cno cnr co- coa coc cof cok con coo cor cra crc crf crk crn cro crr faa fac faf fak fan fao far fca fcc fcf fck fcn fco fcr ffa ffc fff ffk ffn ffo ffr fka fkc fkf fkk fna fnc fnf fnk fnn fnr foa foc fof fok fon foo for fra frc frf frk frn fro frr ka- kaa kac kaf kak kan kao kar kca kcc kck kcn kcr kfa kfc kff kfo kkc kkk kkn kkr kn- kna knc knf knk knn kno knr koa koc kof kok kon koo kor kra krc krf krk krn kro krr naa nac naf nak nan nao nar nca ncc ncf nck ncn nco ncr nfa nfc nff nfk nfn nfo nfr nka nkc nkf nkk nkn nko nkr nna nnc nnf nnk nnn nno no- noa noc nof nok non noo nor nra nrc nrf nrk nrn nro nrr oaa oac oaf oak oan oao oar oc- oca occ ocf ock ocn oco ocr of- ofa ofc off ofn ofo ofr oka okc okk oko okr on- ona onc onf onk onn ono onr oo- ooa ooc oof ook oon ooo oor or- ora orc orf ork orn oro orr ra- raa rac raf rak ran rao rar rca rcc rcf rcn rco rcr rfa rfc rff rfk rfn rfo rfr rkc rkf rkk rko rna rnc rnn rno rnr roa roc rof rok ron roo ror rra rrc rrf rrk rrn rrr