-er a-a a-c a-t aaa aac aad aae aan aap aar aas aat ac- aca acc acd ace acn acp acr acs act ad- ada adc add ade adn adp adr ads adt aea aec aed aee aen aep aer aes aet an- ana anc and ane ann anp anr ans ant ap- apa apc apd ape apn app apr aps apt ar- ara arc ard are arn arp arr ars art as- asa asc asd ase asn asp asr ass ast at- ata atc atd ate atn atp atr ats att c-- caa cac cad cae can cap car cas cat cca ccc ccd cce ccn ccp ccr ccs cct cda cdc cdd cde cdn cdp cdr cds cdt ce- cea cec ced cee cen cep cer ces cet cn- cna cnc cnd cne cnn cnp cnr cns cnt cpa cpc cpd cpe cpn cpp cpr cps cpt cra crc crd cre crn crp crr crs crt csa csc csd cse csn csp csr css cst cta ctc ctd cte ctn ctp ctr cts ctt daa dac dad dae dan dap dar das dat dca dcc dcd dce dcn dcp dcr dcs dct dda ddc ddd dde ddn ddp ddr dds ddt de- dea dec ded dee den dep der des det dna dnc dnd dne dnn dnp dnr dns dnt dpa dpc dpd dpe dpn dpp dpr dps dpt dra drc drd dre drn drp drr drs drt dsa dsc dsd dse dsn dsp dsr dss dst dta dtc dtd dte dtn dtp dtr dts dtt eaa eac ead eae ean eap ear eas eat ec- eca ecc ecd ece ecn ecr ecs ect ed- eda edc edd ede edn edp edr eds edt eea eec eed eee een eep eer ees eet en- ena enc end ene enn enp enr ens ent ep- epa epc epd epe epn epp epr eps ept era erc erd ere ern erp err ers ert es- esa esc esd ese esn esp esr ess est eta etc etd ete etn etp etr ets ett naa nac nad nae nan nap nar nas nat nca ncc ncd nce ncn ncp ncr ncs nct nda ndc ndd nde ndn ndp ndr nds ndt ne- nea nec ned nee nen nep ner nes net nna nnc nne nnn nnp nns nnt npa npc npd npe npn npp npr nps npt nra nrc nrd nre nrn nrp nrr nrs nrt nsa nsc nsd nse nsn nsp nsr nss nst nta ntc ntd nte ntn ntp ntr nts ntt p-p paa pac pad pae pan pap par pas pat pca pcc pcd pce pcn pcp pcr pcs pct pda pdc pdd pde pdn pdp pdr pds pdt pea pec ped pee pen pep per pes pet pn- pna pnc pnd pne pnn pnp pnr pns pnt ppa ppc ppd ppe ppn ppp ppr pps ppt pra prc prd pre prn prp prr prs prt ps- psa psc psd pse psn psp psr pss pst pt- pta ptc ptd pte ptn ptp ptr pts ptt ra- raa rac rad rae ran rap rar ras rat rca rcc rcd rce rcn rcp rcr rcs rct rda rdc rdd rde rdn rdp rdr rds rdt re- rea rec red ree ren rep rer res ret rna rnc rnd rnn rnp rnr rns rnt rpa rpc rpd rpe rpn rpp rpr rps rpt rra rrc rrd rrn rrp rrr rrs rrt rsa rsc rsd rse rsn rsp rsr rss rst rta rtc rtd rte rtn rtp rtr rts rtt saa sac sad sae san sap sar sas sat sca scc scd sce scn scp scr scs sct sda sdc sdd sde sdn sdp sdr sds sdt se- sea sec sed see sen sep ser ses set sna snc snd sne snn snp snr sns snt spa spc spd spe spn spp spr sps spt sr- sra src srd sre srn srp srr srs srt ss- ssa ssc ssd sse ssn ssp ssr sss sst sta stc std ste stn stp str sts stt taa tac tad tae tan tap tar tas tat tca tcc tcd tce tcn tcp tcr tcs tct tda tdc tdd tde tdn tdp tdr tds tdt te- tea tec ted tee ten tep ter tes tet tna tnc tnd tne tnn tnp tnr tns tnt tpa tpc tpd tpe tpn tpp tpr tps tpt tra trc trd tre trn trp trr trs trt tsa tsc tsd tse tsn tsp tsr tss tst tta ttc ttd tte ttn ttp ttr tts ttt