-er a-a a-c a-t aaa aac aae aaf aak aao aap aar aat ac- aca acc ace acf ack aco acp acr act aea aec aee aef aek aeo aep aer aet af- afa afc afe aff afk afo afp afr aft aka akc ake akk ako akp akr aoa aoc aoe aof aok aoo aop aor aot ap- apa apc ape apf apk apo app apr apt ar- ara arc are arf ark aro arp arr art at- ata atc ate atf ato atp atr att c-- caa cac cae caf cak cao cap car cat cca ccc cce ccf cck cco ccp ccr cct ce- cea cec cee cef cek ceo cep cer cet cfa cfc cfe cff cfk cfo cfp cfr cft cka ckc cko ckt co- coa coc coe cof cok coo cop cor cot cpa cpc cpe cpf cpk cpo cpp cpr cpt cra crc cre crf crk cro crp crr crt cta ctc cte ctf ctk cto ctp ctr ctt eaa eac eae eaf eak eao eap ear eat ec- eca ecc ece ecf eck eco ecr ect eea eec eee eef eek eeo eep eer eet ef- efa efc efe eff efo efp efr eft eka ekc eke ekf eko ekp ekr ekt eo- eoa eoc eoe eof eok eoo eop eor eot ep- epa epc epe epf epo epp epr ept era erc ere erf erk ero erp err ert eta etc ete etf etk eto etp etr ett faa fac fae faf fak fao fap far fat fca fcc fce fcf fck fco fcp fcr fct fea fec fee fef fek feo fep fer fet ffa ffc ffe fff ffk ffo ffp ffr fft fka fkc fkf fkk fkp fkt foa foc foe fof fok foo fop for fot fpa fpc fpe fpk fpo fpp fpr fpt fra frc fre frf frk fro frp frr frt fta ftc fte ftf ftk fto ftp ftr ftt k-t ka- kaa kac kae kaf kak kao kap kar kat kca kcc kce kck kcp kcr kct ke- kea kec kee kef kek keo kep ker ket kfa kfc kff kfo kkc kke kkk kkp kkr kkt koa koc koe kof kok koo kop kor kot kpa kpc kpe kpf kpk kpo kpp kpr kpt kra krc krf krk kro krp krr krt kta ktc kte ktf ktk kto ktp ktr ktt oaa oac oae oaf oak oao oap oar oat oc- oca occ ocf ock oco ocp ocr oct oea oec oee oef oeo oep oer oet of- ofa ofc ofe off ofo ofp ofr oft oka okc oke okk oko okp okr oo- ooa ooc oof ook ooo oop oor oot op- opa opc ope opf opk opo opp opr opt or- ora orc ore orf ork oro orp orr ort ot- ota otc ote otf otk oto otp otr ott p-p paa pac pae paf pak pao pap par pat pca pcc pce pcf pck pco pcp pcr pct pea pec pee pef pek peo pep per pet pfa pfc pfe pff pfk pfo pfp pfr pft pka pkc pke pkf pko pkp pkr pkt poa poc poe pof pok poo pop por pot ppa ppc ppe ppf ppk ppo ppp ppr ppt pra prc pre prf prk pro prp prr prt pt- pta ptc pte ptf ptk pto ptp ptr ptt ra- raa rac rae raf rak rao rap rar rat rca rcc rce rcf rco rcp rcr rct re- rea rec ree ref rek reo rep rer ret rfa rfc rfe rff rfk rfo rfp rfr rft rkc rke rkf rkk rko rkp rkt roa roc roe rof rok roo rop ror rot rpa rpc rpe rpf rpk rpo rpp rpr rpt rra rrc rrf rrk rrp rrr rrt rta rtc rte rtf rtk rto rtp rtr rtt taa tac tae taf tak tao tap tar tat tca tcc tce tcf tck tco tcp tcr tct te- tea tec tee tef tek teo tep ter tet tfa tfc tfe tff tfk tfo tfp tfr tft tka tkc tke tkk tko tkp tkr tkt to- toa toc toe tof tok too top tor tot tpa tpc tpe tpf tpk tpo tpp tpr tpt tra trc tre trf trk tro trp trr trt tta ttc tte ttf ttk tto ttp ttr ttt