-er a-a a-c a-t aaa aac aae aao aap aar aas aat ac- aca acc ace aco acp acr acs act aea aec aee aeo aep aer aes aet aoa aoc aoe aoo aop aor aos aot ap- apa apc ape apo app apr aps apt ar- ara arc are aro arp arr ars art as- asa asc ase aso asp asr ass ast at- ata atc ate ato atp atr ats att c-- caa cac cae cao cap car cas cat cca ccc cce cco ccp ccr ccs cct ce- cea cec cee ceo cep cer ces cet co- coa coc coe coo cop cor cos cot cpa cpc cpe cpo cpp cpr cps cpt cra crc cre cro crp crr crs crt csa csc cse cso csp csr css cst cta ctc cte cto ctp ctr cts ctt eaa eac eae eao eap ear eas eat ec- eca ecc ece eco ecr ecs ect eea eec eee eeo eep eer ees eet eo- eoa eoc eoe eoo eop eor eos eot ep- epa epc epe epo epp epr eps ept era erc ere ero erp err ers ert es- esa esc ese eso esp esr ess est eta etc ete eto etp etr ets ett oaa oac oae oao oap oar oas oat oc- oca occ oco ocp ocr ocs oct oea oec oee oeo oep oer oes oet oo- ooa ooc ooo oop oor oos oot op- opa opc ope opo opp opr ops opt or- ora orc ore oro orp orr ors ort os- osa osc ose oso osp osr oss ost ot- ota otc ote oto otp otr ots ott p-p paa pac pae pao pap par pas pat pca pcc pce pco pcp pcr pcs pct pea pec pee peo pep per pes pet poa poc poe poo pop por pos pot ppa ppc ppe ppo ppp ppr pps ppt pra prc pre pro prp prr prs prt ps- psa psc pse pso psp psr pss pst pt- pta ptc pte pto ptp ptr pts ptt ra- raa rac rae rao rap rar ras rat rca rcc rce rco rcp rcr rcs rct re- rea rec ree reo rep rer res ret roa roc roe roo rop ror ros rot rpa rpc rpe rpo rpp rpr rps rpt rra rrc rrp rrr rrs rrt rsa rsc rse rso rsp rsr rss rst rta rtc rte rto rtp rtr rts rtt saa sac sae sao sap sar sas sat sca scc sce sco scp scr scs sct se- sea sec see seo sep ser ses set soa soc soe soo sop sor sos sot spa spc spe spo spp spr sps spt sr- sra src sre sro srp srr srs srt ss- ssa ssc sse sso ssp ssr sss sst sta stc ste sto stp str sts stt taa tac tae tao tap tar tas tat tca tcc tce tco tcp tcr tcs tct te- tea tec tee teo tep ter tes tet to- toa toc toe too top tor tos tot tpa tpc tpe tpo tpp tpr tps tpt tra trc tre tro trp trr trs trt tsa tsc tse tso tsp tsr tss tst tta ttc tte tto ttp ttr tts ttt