-er a-a a-c a-t aaa aac aae aak aao aap aar aas aat ac- aca acc ace ack aco acp acr acs act aea aec aee aek aeo aep aer aes aet aka akc ake akk ako akp akr aks aoa aoc aoe aok aoo aop aor aos aot ap- apa apc ape apk apo app apr aps apt ar- ara arc are ark aro arp arr ars art as- asa asc ase ask aso asp asr ass ast at- ata atc ate ato atp atr ats att c-- caa cac cae cak cao cap car cas cat cca ccc cce cck cco ccp ccr ccs cct ce- cea cec cee cek ceo cep cer ces cet cka ckc cko cks ckt co- coa coc coe cok coo cop cor cos cot cpa cpc cpe cpk cpo cpp cpr cps cpt cra crc cre crk cro crp crr crs crt csa csc cse csk cso csp csr css cst cta ctc cte ctk cto ctp ctr cts ctt eaa eac eae eak eao eap ear eas eat ec- eca ecc ece eck eco ecr ecs ect eea eec eee eek eeo eep eer ees eet eka ekc eke eko ekp ekr eks ekt eo- eoa eoc eoe eok eoo eop eor eos eot ep- epa epc epe epo epp epr eps ept era erc ere erk ero erp err ers ert es- esa esc ese esk eso esp esr ess est eta etc ete etk eto etp etr ets ett k-t ka- kaa kac kae kak kao kap kar kas kat kca kcc kce kck kcp kcr kcs kct ke- kea kec kee kek keo kep ker kes ket kkc kke kkk kkp kkr kks kkt koa koc koe kok koo kop kor kos kot kpa kpc kpe kpk kpo kpp kpr kps kpt kra krc krk kro krp krr krs krt ksa ksc kse ksk kso ksp ksr kss kst kta ktc kte ktk kto ktp ktr kts ktt oaa oac oae oak oao oap oar oas oat oc- oca occ ock oco ocp ocr ocs oct oea oec oee oeo oep oer oes oet oka okc oke okk oko okp okr oks oo- ooa ooc ook ooo oop oor oos oot op- opa opc ope opk opo opp opr ops opt or- ora orc ore ork oro orp orr ors ort os- osa osc ose osk oso osp osr oss ost ot- ota otc ote otk oto otp otr ots ott p-p paa pac pae pak pao pap par pas pat pca pcc pce pck pco pcp pcr pcs pct pea pec pee pek peo pep per pes pet pka pkc pke pko pkp pkr pks pkt poa poc poe pok poo pop por pos pot ppa ppc ppe ppk ppo ppp ppr pps ppt pra prc pre prk pro prp prr prs prt ps- psa psc pse psk pso psp psr pss pst pt- pta ptc pte ptk pto ptp ptr pts ptt ra- raa rac rae rak rao rap rar ras rat rca rcc rce rco rcp rcr rcs rct re- rea rec ree rek reo rep rer res ret rkc rke rkk rko rkp rks rkt roa roc roe rok roo rop ror ros rot rpa rpc rpe rpk rpo rpp rpr rps rpt rra rrc rrk rrp rrr rrs rrt rsa rsc rse rsk rso rsp rsr rss rst rta rtc rte rtk rto rtp rtr rts rtt saa sac sae sak sao sap sar sas sat sca scc sce sck sco scp scr scs sct se- sea sec see sek seo sep ser ses set sk- ska skc ske skk sko skp skr sks skt soa soc soe sok soo sop sor sos sot spa spc spe spk spo spp spr sps spt sr- sra src sre srk sro srp srr srs srt ss- ssa ssc sse ssk sso ssp ssr sss sst sta stc ste stk sto stp str sts stt taa tac tae tak tao tap tar tas tat tca tcc tce tck tco tcp tcr tcs tct te- tea tec tee tek teo tep ter tes tet tka tkc tke tkk tko tkp tkr tks tkt to- toa toc toe tok too top tor tos tot tpa tpc tpe tpk tpo tpp tpr tps tpt tra trc tre trk tro trp trr trs trt tsa tsc tse tsk tso tsp tsr tss tst tta ttc tte ttk tto ttp ttr tts ttt