-er a-a a-c a-t aaa aac aae aak aao aar aat aau ac- aca acc ace ack aco acr act acu aea aec aee aek aeo aer aet aeu aka akc ake akk ako akr aku aoa aoc aoe aok aoo aor aot aou ar- ara arc are ark aro arr art aru at- ata atc ate ato atr att atu au- aua auc aue auk auo aur aut c-- caa cac cae cak cao car cat cau cca ccc cce cck cco ccr cct ccu ce- cea cec cee cek ceo cer cet ceu cka ckc cko ckt co- coa coc coe cok coo cor cot cou cra crc cre crk cro crr crt cru cta ctc cte ctk cto ctr ctt ctu cua cuc cue cuk cuo cur cut cuu eaa eac eae eak eao ear eat eau ec- eca ecc ece eck eco ecr ect ecu eea eec eee eek eeo eer eet eka ekc eke eko ekr ekt eku eo- eoa eoc eoe eok eoo eor eot eou era erc ere erk ero err ert eru eta etc ete etk eto etr ett etu eu- eua euc eue eur eut k-t ka- kaa kac kae kak kao kar kat kau kca kcc kce kck kcr kct kcu ke- kea kec kee kek keo ker ket kkc kke kkk kkr kkt kku koa koc koe kok koo kor kot kou kra krc krk kro krr krt kru kta ktc kte ktk kto ktr ktt ktu kuc kue kuk kur kut kuu oaa oac oae oak oao oar oat oau oc- oca occ ock oco ocr oct ocu oea oec oee oeo oer oet oka okc oke okk oko okr oku oo- ooa ooc ook ooo oor oot or- ora orc ore ork oro orr ort oru ot- ota otc ote otk oto otr ott otu ou- oua ouc oue ouk ouo our out ra- raa rac rae rak rao rar rat rau rca rcc rce rco rcr rct rcu re- rea rec ree rek reo rer ret reu rkc rke rkk rko rkt rku roa roc roe rok roo ror rot rou rra rrc rrk rrr rrt rru rta rtc rte rtk rto rtr rtt rtu rua ruc rue ruk ruo rur rut ruu taa tac tae tak tao tar tat tau tca tcc tce tck tco tcr tct tcu te- tea tec tee tek teo ter tet teu tka tkc tke tkk tko tkr tkt to- toa toc toe tok too tor tot tou tra trc tre trk tro trr trt tru tta ttc tte ttk tto ttr ttt ttu tua tuc tue tuk tuo tur tut tuu ua- uaa uac uae uak uao uar uat uau uca ucc uce uck uco ucr uct ucu uea uec uee uer uet uka ukc uke ukk ukr uku uoa uoc uoe uok uoo uor uot ur- ura urc ure urk uro urr urt uru uta utc ute utk uto utr utt utu uua uuc uue uur uut uuu