-er a-a a-b a-c a-t aaa aab aac aad aae aao aap aar aas aat ab- aba abb abc abd abe abo abp abr abs abt ac- aca acb acc acd ace aco acp acr acs act ad- ada adb adc add ade ado adp adr ads adt aea aeb aec aed aee aeo aep aer aes aet aoa aob aoc aod aoe aoo aop aor aos aot ap- apa apb apc apd ape apo app apr aps apt ar- ara arb arc ard are aro arp arr ars art as- asa asb asc asd ase aso asp asr ass ast at- ata atb atc atd ate ato atp atr ats att b-p baa bab bac bad bae bao bap bar bas bat bba bbb bbc bbd bbe bbo bbp bbr bbs bbt bca bcb bcc bcd bce bco bcp bcr bcs bct bda bdb bdc bdd bde bdo bdp bdr bds bdt be- bea beb bec bed bee beo bep ber bes bet boa bob boc bod boe boo bop bor bos bot bpa bpb bpc bpd bpe bpo bpp bpr bps bpt bra brb brd bre bro brp brr brs brt bsa bsb bsc bsd bse bso bsp bsr bss bst bta btb btc btd bte bto btp btr bts btt c-- caa cab cac cad cae cao cap car cas cat cba cbb cbc cbd cbe cbo cbp cbr cbs cbt cca ccb ccc ccd cce cco ccp ccr ccs cct cda cdb cdc cdd cde cdo cdp cdr cds cdt ce- cea ceb cec ced cee ceo cep cer ces cet co- coa cob coc cod coe coo cop cor cos cot cpa cpb cpc cpd cpe cpo cpp cpr cps cpt cra crb crc crd cre cro crp crr crs crt csa csb csc csd cse cso csp csr css cst cta ctb ctc ctd cte cto ctp ctr cts ctt daa dab dac dad dae dao dap dar das dat dba dbb dbc dbd dbe dbo dbp dbr dbs dbt dca dcb dcc dcd dce dco dcp dcr dcs dct dda ddb ddc ddd dde ddo ddp ddr dds ddt de- dea deb dec ded dee deo dep der des det doa dob doc dod doe doo dop dor dos dot dpa dpb dpc dpd dpe dpo dpp dpr dps dpt dra drb drc drd dre dro drp drr drs drt dsa dsb dsc dsd dse dso dsp dsr dss dst dta dtb dtc dtd dte dto dtp dtr dts dtt eaa eab eac ead eae eao eap ear eas eat eba ebb ebc ebd ebe ebo ebp ebr ebs ebt ec- eca ecb ecc ecd ece eco ecr ecs ect ed- eda edb edc edd ede edo edp edr eds edt eea eeb eec eed eee eeo eep eer ees eet eo- eoa eob eoc eod eoe eoo eop eor eos eot ep- epa epb epc epd epe epo epp epr eps ept era erb erc erd ere ero erp err ers ert es- esa esb esc esd ese eso esp esr ess est eta etb etc etd ete eto etp etr ets ett oaa oab oac oad oae oao oap oar oas oat ob- oba obb obc obd obe obo obp obr obs obt oc- oca ocb occ ocd oco ocp ocr ocs oct oda odb odc odd ode odo odp odr ods odt oea oeb oec oed oee oeo oep oer oes oet oo- ooa oob ooc ood ooo oop oor oos oot op- opa opb opc opd ope opo opp opr ops opt or- ora orb orc ord ore oro orp orr ors ort os- osa osb osc osd ose oso osp osr oss ost ot- ota otb otc otd ote oto otp otr ots ott p-p paa pab pac pad pae pao pap par pas pat pba pbb pbc pbd pbe pbo pbp pbr pbs pbt pca pcb pcc pcd pce pco pcp pcr pcs pct pda pdb pdc pdd pde pdo pdp pdr pds pdt pea peb pec ped pee peo pep per pes pet poa pob poc pod poe poo pop por pos pot ppa ppb ppc ppd ppe ppo ppp ppr pps ppt pra prb prc prd pre pro prp prr prs prt ps- psa psb psc psd pse pso psp psr pss pst pt- pta ptb ptc ptd pte pto ptp ptr pts ptt ra- raa rab rac rad rae rao rap rar ras rat rba rbb rbc rbd rbe rbo rbp rbr rbs rbt rca rcb rcc rcd rce rco rcp rcr rcs rct rda rdb rdc rdd rde rdo rdp rdr rds rdt re- rea reb rec red ree reo rep rer res ret roa rob roc rod roe roo rop ror ros rot rpa rpb rpc rpd rpe rpo rpp rpr rps rpt rra rrb rrc rrd rrp rrr rrs rrt rsa rsb rsc rsd rse rso rsp rsr rss rst rta rtb rtc rtd rte rto rtp rtr rts rtt saa sab sac sad sae sao sap sar sas sat sba sbb sbc sbd sbe sbo sbp sbr sbs sbt sca scb scc scd sce sco scp scr scs sct sda sdb sdc sdd sde sdo sdp sdr sds sdt se- sea seb sec sed see seo sep ser ses set soa sob soc sod soe soo sop sor sos sot spa spb spc spd spe spo spp spr sps spt sr- sra srb src srd sre sro srp srr srs srt ss- ssa ssb ssc ssd sse sso ssp ssr sss sst sta stb stc std ste sto stp str sts stt taa tab tac tad tae tao tap tar tas tat tba tbb tbc tbd tbe tbo tbp tbr tbs tbt tca tcb tcc tcd tce tco tcp tcr tcs tct tda tdb tdc tdd tde tdo tdp tdr tds tdt te- tea teb tec ted tee teo tep ter tes tet to- toa tob toc tod toe too top tor tos tot tpa tpb tpc tpd tpe tpo