-er a-a a-c a-t aaa aac aae aaf aak aan aao aar aat ac- aca acc ace acf ack acn aco acr act aea aec aee aef aek aen aeo aer aet af- afa afc afe aff afk afn afo afr aft aka akc ake akk akn ako akr an- ana anc ane anf ank ann ano anr ant aoa aoc aoe aof aok aon aoo aor aot ar- ara arc are arf ark arn aro arr art at- ata atc ate atf atn ato atr att c-- caa cac cae caf cak can cao car cat cca ccc cce ccf cck ccn cco ccr cct ce- cea cec cee cef cek cen ceo cer cet cfa cfc cfe cff cfk cfn cfo cfr cft cka ckc cko ckt cn- cna cnc cne cnf cnn cno cnr cnt co- coa coc coe cof cok con coo cor cot cra crc cre crf crk crn cro crr crt cta ctc cte ctf ctk ctn cto ctr ctt eaa eac eae eaf eak ean eao ear eat ec- eca ecc ece ecf eck ecn eco ecr ect eea eec eee eef eek een eeo eer eet ef- efa efc efe eff efo efr eft eka ekc eke ekf eko ekr ekt en- ena enc ene enf enk enn eno enr ent eo- eoa eoc eoe eof eok eon eoo eor eot era erc ere erf erk ern ero err ert eta etc ete etf etk etn eto etr ett faa fac fae faf fak fan fao far fat fca fcc fce fcf fck fcn fco fcr fct fea fec fee fef fek fen feo fer fet ffa ffc ffe fff ffk ffn ffo ffr fft fka fkc fkf fkk fkt fna fnc fne fnf fnk fnn fnr fnt foa foc foe fof fok fon foo for fot fra frc fre frf frk frn fro frr frt fta ftc fte ftf ftk ftn fto ftr ftt k-t ka- kaa kac kae kaf kak kan kao kar kat kca kcc kce kck kcn kcr kct ke- kea kec kee kef kek ken keo ker ket kfa kfc kff kfo kkc kke kkk kkn kkr kkt kn- kna knc kne knf knk knn kno knr knt koa koc koe kof kok kon koo kor kot kra krc krf krk krn kro krr krt kta ktc kte ktf ktk ktn kto ktr ktt naa nac nae naf nak nan nao nar nat nca ncc nce ncf nck ncn nco ncr nct ne- nea nec nee nef nek nen neo ner net nfa nfc nfe nff nfk nfn nfo nfr nft nka nkc nke nkf nkk nkn nko nkr nkt nna nnc nne nnf nnk nnn nno nnt no- noa noc noe nof nok non noo nor not nra nrc nre nrf nrk nrn nro nrr nrt nta ntc nte ntf ntk ntn nto ntr ntt oaa oac oae oaf oak oan oao oar oat oc- oca occ ocf ock ocn oco ocr oct oea oec oee oef oen oeo oer oet of- ofa ofc ofe off ofn ofo ofr oft oka okc oke okk oko okr on- ona onc one onf onk onn ono onr ont oo- ooa ooc oof ook oon ooo oor oot or- ora orc ore orf ork orn oro orr ort ot- ota otc ote otf otk otn oto otr ott ra- raa rac rae raf rak ran rao rar rat rca rcc rce rcf rcn rco rcr rct re- rea rec ree ref rek ren reo rer ret rfa rfc rfe rff rfk rfn rfo rfr rft rkc rke rkf rkk rko rkt rna rnc rnn rno rnr rnt roa roc roe rof rok ron roo ror rot rra rrc rrf rrk rrn rrr rrt rta rtc rte rtf rtk rtn rto rtr rtt taa tac tae taf tak tan tao tar tat tca tcc tce tcf tck tcn tco tcr tct te- tea tec tee tef tek ten teo ter tet tfa tfc tfe tff tfk tfn tfo tfr tft tka tkc tke tkk tko tkr tkt tna tnc tne tnf tnk tnn tno tnr tnt to- toa toc toe tof tok ton too tor tot tra trc tre trf trk trn tro trr trt tta ttc tte ttf ttk ttn tto ttr ttt