-er a-a a-c a-t aaa aac aad aae aap aar aas aat ac- aca acc acd ace acp acr acs act ad- ada adc add ade adp adr ads adt aea aec aed aee aep aer aes aet ap- apa apc apd ape app apr aps apt ar- ara arc ard are arp arr ars art as- asa asc asd ase asp asr ass ast at- ata atc atd ate atp atr ats att c-- caa cac cad cae cap car cas cat cca ccc ccd cce ccp ccr ccs cct cda cdc cdd cde cdp cdr cds cdt ce- cea cec ced cee cep cer ces cet cpa cpc cpd cpe cpp cpr cps cpt cra crc crd cre crp crr crs crt csa csc csd cse csp csr css cst cta ctc ctd cte ctp ctr cts ctt daa dac dad dae dap dar das dat dca dcc dcd dce dcp dcr dcs dct dda ddc ddd dde ddp ddr dds ddt de- dea dec ded dee dep der des det dpa dpc dpd dpe dpp dpr dps dpt dra drc drd dre drp drr drs drt dsa dsc dsd dse dsp dsr dss dst dta dtc dtd dte dtp dtr dts dtt eaa eac ead eae eap ear eas eat ec- eca ecc ecd ece ecr ecs ect ed- eda edc edd ede edp edr eds edt eea eec eed eee eep eer ees eet ep- epa epc epd epe epp epr eps ept era erc erd ere erp err ers ert es- esa esc esd ese esp esr ess est eta etc etd ete etp etr ets ett p-p paa pac pad pae pap par pas pat pca pcc pcd pce pcp pcr pcs pct pda pdc pdd pde pdp pdr pds pdt pea pec ped pee pep per pes pet ppa ppc ppd ppe ppp ppr pps ppt pra prc prd pre prp prr prs prt ps- psa psc psd pse psp psr pss pst pt- pta ptc ptd pte ptp ptr pts ptt ra- raa rac rad rae rap rar ras rat rca rcc rcd rce rcp rcr rcs rct rda rdc rdd rde rdp rdr rds rdt re- rea rec red ree rep rer res ret rpa rpc rpd rpe rpp rpr rps rpt rra rrc rrd rrp rrr rrs rrt rsa rsc rsd rse rsp rsr rss rst rta rtc rtd rte rtp rtr rts rtt saa sac sad sae sap sar sas sat sca scc scd sce scp scr scs sct sda sdc sdd sde sdp sdr sds sdt se- sea sec sed see sep ser ses set spa spc spd spe spp spr sps spt sr- sra src srd sre srp srr srs srt ss- ssa ssc ssd sse ssp ssr sss sst sta stc std ste stp str sts stt taa tac tad tae tap tar tas tat tca tcc tcd tce tcp tcr tcs tct tda tdc tdd tde tdp tdr tds tdt te- tea tec ted tee tep ter tes tet tpa tpc tpd tpe tpp tpr tps tpt tra trc trd tre trp trr trs trt tsa tsc tsd tse tsp tsr tss tst tta ttc ttd tte ttp ttr tts ttt