-er a-a a-c a-t aaa aac aad aae aao aap aar aas aat ac- aca acc acd ace aco acp acr acs act ad- ada adc add ade ado adp adr ads adt aea aec aed aee aeo aep aer aes aet aoa aoc aod aoe aoo aop aor aos aot ap- apa apc apd ape apo app apr aps apt ar- ara arc ard are aro arp arr ars art as- asa asc asd ase aso asp asr ass ast at- ata atc atd ate ato atp atr ats att c-- caa cac cad cae cao cap car cas cat cca ccc ccd cce cco ccp ccr ccs cct cda cdc cdd cde cdo cdp cdr cds cdt ce- cea cec ced cee ceo cep cer ces cet co- coa coc cod coe coo cop cor cos cot cpa cpc cpd cpe cpo cpp cpr cps cpt cra crc crd cre cro crp crr crs crt csa csc csd cse cso csp csr css cst cta ctc ctd cte cto ctp ctr cts ctt daa dac dad dae dao dap dar das dat dca dcc dcd dce dco dcp dcr dcs dct dda ddc ddd dde ddo ddp ddr dds ddt de- dea dec ded dee deo dep der des det doa doc dod doe doo dop dor dos dot dpa dpc dpd dpe dpo dpp dpr dps dpt dra drc drd dre dro drp drr drs drt dsa dsc dsd dse dso dsp dsr dss dst dta dtc dtd dte dto dtp dtr dts dtt eaa eac ead eae eao eap ear eas eat ec- eca ecc ecd ece eco ecr ecs ect ed- eda edc edd ede edo edp edr eds edt eea eec eed eee eeo eep eer ees eet eo- eoa eoc eod eoe eoo eop eor eos eot ep- epa epc epd epe epo epp epr eps ept era erc erd ere ero erp err ers ert es- esa esc esd ese eso esp esr ess est eta etc etd ete eto etp etr ets ett oaa oac oad oae oao oap oar oas oat oc- oca occ ocd oco ocp ocr ocs oct oda odc odd ode odo odp odr ods odt oea oec oed oee oeo oep oer oes oet oo- ooa ooc ood ooo oop oor oos oot op- opa opc opd ope opo opp opr ops opt or- ora orc ord ore oro orp orr ors ort os- osa osc osd ose oso osp osr oss ost ot- ota otc otd ote oto otp otr ots ott p-p paa pac pad pae pao pap par pas pat pca pcc pcd pce pco pcp pcr pcs pct pda pdc pdd pde pdo pdp pdr pds pdt pea pec ped pee peo pep per pes pet poa poc pod poe poo pop por pos pot ppa ppc ppd ppe ppo ppp ppr pps ppt pra prc prd pre pro prp prr prs prt ps- psa psc psd pse pso psp psr pss pst pt- pta ptc ptd pte pto ptp ptr pts ptt ra- raa rac rad rae rao rap rar ras rat rca rcc rcd rce rco rcp rcr rcs rct rda rdc rdd rde rdo rdp rdr rds rdt re- rea rec red ree reo rep rer res ret roa roc rod roe roo rop ror ros rot rpa rpc rpd rpe rpo rpp rpr rps rpt rra rrc rrd rrp rrr rrs rrt rsa rsc rsd rse rso rsp rsr rss rst rta rtc rtd rte rto rtp rtr rts rtt saa sac sad sae sao sap sar sas sat sca scc scd sce sco scp scr scs sct sda sdc sdd sde sdo sdp sdr sds sdt se- sea sec sed see seo sep ser ses set soa soc sod soe soo sop sor sos sot spa spc spd spe spo spp spr sps spt sr- sra src srd sre sro srp srr srs srt ss- ssa ssc ssd sse sso ssp ssr sss sst sta stc std ste sto stp str sts stt taa tac tad tae tao tap tar tas tat tca tcc tcd tce tco tcp tcr tcs tct tda tdc tdd tde tdo tdp tdr tds tdt te- tea tec ted tee teo tep ter tes tet to- toa toc tod toe too top tor tos tot tpa tpc tpd tpe tpo tpp tpr tps tpt tra trc trd tre tro trp trr trs trt tsa tsc tsd tse tso tsp tsr tss tst tta ttc ttd tte tto ttp ttr tts ttt