a-a aaa aaf aak aan aao aap aar af- afa aff afk afn afo afp afr aka akk akn ako akp akr an- ana anf ank ann ano anp anr aoa aof aok aon aoo aop aor ap- apa apf apk apn apo app apr ar- ara arf ark arn aro arp arr faa faf fak fan fao fap far ffa fff ffk ffn ffo ffp ffr fka fkf fkk fkp fna fnf fnk fnn fnp fnr foa fof fok fon foo fop for fpa fpk fpn fpo fpp fpr fra frf frk frn fro frp frr ka- kaa kaf kak kan kao kap kar kfa kff kfo kkk kkn kkp kkr kn- kna knf knk knn kno knp knr koa kof kok kon koo kop kor kpa kpf kpk kpn kpo kpp kpr kra krf krk krn kro krp krr naa naf nak nan nao nap nar nfa nff nfk nfn nfo nfp nfr nka nkf nkk nkn nko nkp nkr nna nnf nnk nnn nno nnp no- noa nof nok non noo nop nor npa npf npn npo npp npr nra nrf nrk nrn nro nrp nrr oaa oaf oak oan oao oap oar of- ofa off ofn ofo ofp ofr oka okk oko okp okr on- ona onf onk onn ono onp onr oo- ooa oof ook oon ooo oop oor op- opa opf opk opn opo opp opr or- ora orf ork orn oro orp orr p-p paa paf pak pan pao pap par pfa pff pfk pfn pfo pfp pfr pka pkf pkn pko pkp pkr pn- pna pnf pnk pnn pno pnp pnr poa pof pok pon poo pop por ppa ppf ppk ppn ppo ppp ppr pra prf prk prn pro prp prr ra- raa raf rak ran rao rap rar rfa rff rfk rfn rfo rfp rfr rkf rkk rko rkp rna rnn rno rnp rnr roa rof rok ron roo rop ror rpa rpf rpk rpn rpo rpp rpr rra rrf rrk rrn rrp rrr