a-a a-c aaa aac aaf aak aao aap aar ac- aca acc acf ack aco acp acr af- afa afc aff afk afo afp afr aka akc akk ako akp akr aoa aoc aof aok aoo aop aor ap- apa apc apf apk apo app apr ar- ara arc arf ark aro arp arr c-- caa cac caf cak cao cap car cca ccc ccf cck cco ccp ccr cfa cfc cff cfk cfo cfp cfr cka ckc cko co- coa coc cof cok coo cop cor cpa cpc cpf cpk cpo cpp cpr cra crc crf crk cro crp crr faa fac faf fak fao fap far fca fcc fcf fck fco fcp fcr ffa ffc fff ffk ffo ffp ffr fka fkc fkf fkk fkp foa foc fof fok foo fop for fpa fpc fpk fpo fpp fpr fra frc frf frk fro frp frr ka- kaa kac kaf kak kao kap kar kca kcc kck kcp kcr kfa kfc kff kfo kkc kkk kkp kkr koa koc kof kok koo kop kor kpa kpc kpf kpk kpo kpp kpr kra krc krf krk kro krp krr oaa oac oaf oak oao oap oar oc- oca occ ocf ock oco ocp ocr of- ofa ofc off ofo ofp ofr oka okc okk oko okp okr oo- ooa ooc oof ook ooo oop oor op- opa opc opf opk opo opp opr or- ora orc orf ork oro orp orr p-p paa pac paf pak pao pap par pca pcc pcf pck pco pcp pcr pfa pfc pff pfk pfo pfp pfr pka pkc pkf pko pkp pkr poa poc pof pok poo pop por ppa ppc ppf ppk ppo ppp ppr pra prc prf prk pro prp prr ra- raa rac raf rak rao rap rar rca rcc rcf rco rcp rcr rfa rfc rff rfk rfo rfp rfr rkc rkf rkk rko rkp roa roc rof rok roo rop ror rpa rpc rpf rpk rpo rpp rpr rra rrc rrf rrk rrp rrr