-er a-a a-b a-c a-t aaa aab aac aad aae aam aao aar aas aat ab- aba abb abc abd abe abm abo abr abs abt ac- aca acb acc acd ace acm aco acr acs act ad- ada adb adc add ade adm ado adr ads adt aea aeb aec aed aee aem aeo aer aes aet ama amb amc amd ame amm amo amr ams amt aoa aob aoc aod aoe aom aoo aor aos aot ar- ara arb arc ard are arm aro arr ars art as- asa asb asc asd ase asm aso asr ass ast at- ata atb atc atd ate atm ato atr ats att baa bab bac bad bae bam bao bar bas bat bba bbb bbc bbd bbe bbm bbo bbr bbs bbt bca bcb bcc bcd bce bcm bco bcr bcs bct bda bdb bdc bdd bde bdm bdo bdr bds bdt be- bea beb bec bed bee bem beo ber bes bet bma bmb bmc bmd bme bmm bmo bmr bms bmt boa bob boc bod boe bom boo bor bos bot bra brb brd bre brm bro brr brs brt bsa bsb bsc bsd bse bsm bso bsr bss bst bta btb btc btd bte btm bto btr bts btt c-- caa cab cac cad cae cam cao car cas cat cba cbb cbc cbd cbe cbm cbo cbr cbs cbt cca ccb ccc ccd cce ccm cco ccr ccs cct cda cdb cdc cdd cde cdm cdo cdr cds cdt ce- cea ceb cec ced cee cem ceo cer ces cet cma cmb cmc cmd cme cmm cmo cmr cms cmt co- coa cob coc cod coe com coo cor cos cot cra crb crc crd cre crm cro crr crs crt csa csb csc csd cse csm cso csr css cst cta ctb ctc ctd cte ctm cto ctr cts ctt daa dab dac dad dae dam dao dar das dat dba dbb dbc dbd dbe dbm dbo dbr dbs dbt dca dcb dcc dcd dce dcm dco dcr dcs dct dda ddb ddc ddd dde ddm ddo ddr dds ddt de- dea deb dec ded dee dem deo der des det dma dmb dmc dmd dme dmm dmo dmr dms dmt doa dob doc dod doe dom doo dor dos dot dra drb drc drd dre drm dro drr drs drt dsa dsb dsc dsd dse dsm dso dsr dss dst dta dtb dtc dtd dte dtm dto dtr dts dtt eaa eab eac ead eae eam eao ear eas eat eba ebb ebc ebd ebe ebm ebo ebr ebs ebt ec- eca ecb ecc ecd ece ecm eco ecr ecs ect ed- eda edb edc edd ede edm edo edr eds edt eea eeb eec eed eee eem eeo eer ees eet em- ema emb emc emd eme emm emo emr ems emt eo- eoa eob eoc eod eoe eom eoo eor eos eot era erb erc erd ere erm ero err ers ert es- esa esb esc esd ese esm eso esr ess est eta etb etc etd ete etm eto etr ets ett m-o m-r maa mab mac mad mae mam mao mar mas mat mba mbb mbc mbd mbe mbm mbo mbr mbs mbt mc- mca mcb mcc mcd mce mcm mco mcr mcs mct mda mdb mdc mdd mde mdm mdo mdr mds mdt mea meb mec med mee mem meo mer mes met mma mmb mmc mmd mme mmm mmo mmr mms mmt moa mob moc mod moe mom moo mor mos mot mra mrb mrc mrd mre mrm mro mrr mrs mrt msa msb msc msd mse msm mso msr mss mst mta mtb mtc mtd mte mtm mto mtr mts mtt oaa oab oac oad oae oam oao oar oas oat ob- oba obb obc obd obe obm obo obr obs obt oc- oca ocb occ ocd ocm oco ocr ocs oct oda odb odc odd ode odm odo odr ods odt oea oeb oec oed oee oem oeo oer oes oet om- oma omb omc omd ome omm omo omr oms omt oo- ooa oob ooc ood oom ooo oor oos oot or- ora orb orc ord ore orm oro orr ors ort os- osa osb osc osd ose osm oso osr oss ost ot- ota otb otc otd ote otm oto otr ots ott ra- raa rab rac rad rae ram rao rar ras rat rba rbb rbc rbd rbe rbm rbo rbr rbs rbt rca rcb rcc rcd rce rcm rco rcr rcs rct rda rdb rdc rdd rde rdm rdo rdr rds rdt re- rea reb rec red ree rem reo rer res ret rma rmb rmc rmd rme rmm rmo rmr rms rmt roa rob roc rod roe rom roo ror ros rot rra rrb rrc rrd rrm rrr rrs rrt rsa rsb rsc rsd rse rsm rso rsr rss rst rta rtb rtc rtd rte rtm rto rtr rts rtt saa sab sac sad sae sam sao sar sas sat sba sbb sbc sbd sbe sbm sbo sbr sbs sbt sca scb scc scd sce scm sco scr scs sct sda sdb sdc sdd sde sdm sdo sdr sds sdt se- sea seb sec sed see sem seo ser ses set sma smb smc smd sme smm smo smr sms smt soa sob soc sod soe som soo sor sos sot sr- sra srb src srd sre srm sro srr srs srt ss- ssa ssb ssc ssd sse ssm sso ssr sss sst sta stb stc std ste stm sto str sts stt taa tab tac tad tae tam tao tar tas tat tba tbb tbc tbd tbe tbm tbo tbr tbs tbt tca tcb tcc tcd tce tcm tco tcr tcs tct tda tdb tdc tdd tde tdm tdo tdr tds tdt te- tea teb tec ted tee tem teo ter tes tet tma tmb tmc tmd tme tmm tmo tmr tms tmt to- toa tob toc tod toe tom too