a-a aaa aaf aak aao aar aaw af- afa aff afk afo afr afw aka akk ako akr akw aoa aof aok aoo aor aow ar- ara arf ark aro arr arw aw- awa awf awk awo awr aww faa faf fak fao far faw ffa fff ffk ffo ffr ffw fka fkf fkk foa fof fok foo for fow fra frf frk fro frr frw fwa fwf fwo ka- kaa kaf kak kao kar kaw kfa kff kfo kfw kkk kkr koa kof kok koo kor kow kra krf krk kro krr krw kw- kwa kwf kwk kwo kww oaa oaf oak oao oar oaw of- ofa off ofo ofr ofw oka okk oko okr okw oo- ooa oof ook ooo oor oow or- ora orf ork oro orr owa owf owk owo oww ra- raa raf rak rao rar raw rfa rff rfk rfo rfr rfw rkf rkk rko roa rof rok roo ror row rra rrf rrk rrr rwa rwf rwr waa waf wak wao war waw wfa wff wfk wfo wfr wfw wka wkf wko wkr wkw woa wof wok woo wor wow wr- wra wrf wrk wro wrr wrw wwa wwf wwo www