-er a-a a-c aaa aac aae aaf aah aak aan aao aar ac- aca acc ace acf ach ack acn aco acr aea aec aee aef aeh aek aen aeo aer af- afa afc afe aff afh afk afn afo afr aha ahc ahe ahf ahh ahk ahn aho ahr aka akc ake akh akk akn ako akr an- ana anc ane anf anh ank ann ano anr aoa aoc aoe aof aoh aok aon aoo aor ar- ara arc are arf arh ark arn aro arr c-- caa cac cae caf cah cak can cao car cca ccc cce ccf cch cck ccn cco ccr ce- cea cec cee cef ceh cek cen ceo cer cfa cfc cfe cff cfh cfk cfn cfo cfr ch- cha chc che chf chh chk chn cho chr cka ckc ckh cko cn- cna cnc cne cnf cnh cnn cno cnr co- coa coc coe cof coh cok con coo cor cra crc cre crf crh crk crn cro crr eaa eac eae eaf eah eak ean eao ear ec- eca ecc ece ecf ech eck ecn eco ecr eea eec eee eef eek een eeo eer ef- efa efc efe eff efh efo efr eha ehc ehe ehf ehh ehn eho ehr eka ekc eke ekf ekh eko ekr en- ena enc ene enf enh enk enn eno enr eo- eoa eoc eoe eof eoh eok eon eoo eor era erc ere erf erh erk ern ero err faa fac fae faf fah fak fan fao far fca fcc fce fcf fck fcn fco fcr fea fec fee fef feh fek fen feo fer ffa ffc ffe fff ffh ffk ffn ffo ffr fha fhc fhe fhf fhh fhn fho fhr fka fkc fkf fkk fna fnc fne fnf fnh fnk fnn fnr foa foc foe fof foh fok fon foo for fra frc fre frf frh frk frn fro frr haa hac hae haf hah hak han hao har hca hcc hce hcf hch hck hcn hco hcr he- hea hec hee hef heh hek hen heo her hfa hfc hfe hff hfh hfk hfn hfo hfr hha hhc hhe hhf hhh hhk hhn hho hhr hka hkf hkh hkk hkn hko hkr hna hnc hne hnf hnh hnk hnn hno hoa hoc hoe hof hoh hok hon hoo hor hr- hra hrc hre hrf hrh hrk hrn hro hrr ka- kaa kac kae kaf kah kak kan kao kar kca kcc kce kch kck kcn kcr ke- kea kec kee kef keh kek ken keo ker kfa kfc kff kfh kfo kha khe khf khh khk khn kho khr kkc kke kkh kkk kkn kkr kn- kna knc kne knf knk knn kno knr koa koc koe kof koh kok kon koo kor kra krc krf krk krn kro krr naa nac nae naf nah nak nan nao nar nca ncc nce ncf nch nck ncn nco ncr ne- nea nec nee nef neh nek nen neo ner nfa nfc nfe nff nfk nfn nfo nfr nha nhc nhe nhf nhh nhk nhn nhr nka nkc nke nkf nkk nkn nko nkr nna nnc nne nnf nnh nnk nnn nno no- noa noc noe nof noh nok non noo nor nra nrc nre nrf nrk nrn nro nrr oaa oac oae oaf oah oak oan oao oar oc- oca occ ocf och ock ocn oco ocr oea oec oee oef oeh oen oeo oer of- ofa ofc ofe off ofn ofo ofr oha ohc ohe ohf ohh ohn oho ohr oka okc oke okk oko okr on- ona onc one onf onh onk onn ono onr oo- ooa ooc oof ooh ook oon ooo oor or- ora orc ore orf orh ork orn oro orr ra- raa rac rae raf rah rak ran rao rar rca rcc rce rcf rch rcn rco rcr re- rea rec ree ref reh rek ren reo rer rfa rfc rfe rff rfh rfk rfn rfo rfr rh- rha rhc rhe rhf rhh rhn rho rhr rkc rke rkf rkk rko rna rnc rnh rnn rno rnr roa roc roe rof roh rok ron roo ror rra rrc rrf rrh rrk rrn rrr