a-a a-c aaa aac aaf aag aak aan aao aar ac- aca acc acf acg ack acn aco acr af- afa afc aff afg afk afn afo afr ag- aga agc agf agg agk agn ago agr aka akc akg akk akn ako akr an- ana anc anf ang ank ann ano anr aoa aoc aof aog aok aon aoo aor ar- ara arc arf arg ark arn aro arr c-- caa cac caf cag cak can cao car cca ccc ccf ccg cck ccn cco ccr cfa cfc cff cfg cfk cfn cfo cfr cga cgc cgg cgn cgo cgr cka ckc cko cn- cna cnc cnf cng cnn cno cnr co- coa coc cof cog cok con coo cor cra crc crf crg crk crn cro crr faa fac faf fag fak fan fao far fca fcc fcf fcg fck fcn fco fcr ffa ffc fff ffg ffk ffn ffo ffr fga fgc fgf fgg fgn fgr fka fkc fkf fkg fkk fna fnc fnf fng fnk fnn fnr foa foc fof fog fok fon foo for fra frc frf frg frk frn fro frr gaa gac gaf gag gak gan gao gar gca gcc gcf gcg gck gcn gco gcr gfa gfc gff gfk gfo gfr gga ggc ggg ggn ggo ggr gka gkn gko gna gnc gnf gnn gno gnr goa goc gof gog gok gon goo gor gra grc grf grg grk grn gro grr ka- kaa kac kaf kag kak kan kao kar kca kcc kcg kck kcn kcr kfa kfc kff kfg kfo kga kgc kgf kgo kkc kkk kkn kkr kn- kna knc knf kng knk knn kno knr koa koc kof kog kok kon koo kor kra krc krf krg krk krn kro krr naa nac naf nag nak nan nao nar nca ncc ncf ncg nck ncn nco ncr nfa nfc nff nfk nfn nfo nfr nga ngc ngf ngg ngk ngn ngo nka nkc nkf nkk nkn nko nkr nna nnc nnf nng nnk nnn nno no- noa noc nof nog nok non noo nor nra nrc nrf nrg nrk nrn nro nrr oaa oac oaf oag oak oan oao oar oc- oca occ ocf ocg ock ocn oco ocr of- ofa ofc off ofg ofn ofo ofr oga ogc ogf ogg ogn ogo oka okc okg okk oko okr on- ona onc onf ong onk onn ono onr oo- ooa ooc oof oog ook oon ooo oor or- ora orc orf org ork orn oro orr ra- raa rac raf rag rak ran rao rar rca rcc rcf rcg rcn rco rcr rfa rfc rff rfg rfk rfn rfo rfr rga rgc rgf rgg rgk rgn rgo rgr rkc rkf rkg rkk rko rna rnc rng rnn rno rnr roa roc rof rog rok ron roo ror rra rrc rrf rrg rrk rrn rrr