-er a-a a-b a-c a-t aaa aab aac aad aae aam aar aas aat ab- aba abb abc abd abe abm abr abs abt ac- aca acb acc acd ace acm acr acs act ad- ada adb adc add ade adm adr ads adt aea aeb aec aed aee aem aer aes aet ama amb amc amd ame amm amr ams amt ar- ara arb arc ard are arm arr ars art as- asa asb asc asd ase asm asr ass ast at- ata atb atc atd ate atm atr ats att baa bab bac bad bae bam bar bas bat bba bbb bbc bbd bbe bbm bbr bbs bbt bca bcb bcc bcd bce bcm bcr bcs bct bda bdb bdc bdd bde bdm bdr bds bdt be- bea beb bec bed bee bem ber bes bet bma bmb bmc bmd bme bmm bmr bms bmt bra brb brd bre brm brr brs brt bsa bsb bsc bsd bse bsm bsr bss bst bta btb btc btd bte btm btr bts btt c-- caa cab cac cad cae cam car cas cat cba cbb cbc cbd cbe cbm cbr cbs cbt cca ccb ccc ccd cce ccm ccr ccs cct cda cdb cdc cdd cde cdm cdr cds cdt ce- cea ceb cec ced cee cem cer ces cet cma cmb cmc cmd cme cmm cmr cms cmt cra crb crc crd cre crm crr crs crt csa csb csc csd cse csm csr css cst cta ctb ctc ctd cte ctm ctr cts ctt daa dab dac dad dae dam dar das dat dba dbb dbc dbd dbe dbm dbr dbs dbt dca dcb dcc dcd dce dcm dcr dcs dct dda ddb ddc ddd dde ddm ddr dds ddt de- dea deb dec ded dee dem der des det dma dmb dmc dmd dme dmm dmr dms dmt dra drb drc drd dre drm drr drs drt dsa dsb dsc dsd dse dsm dsr dss dst dta dtb dtc dtd dte dtm dtr dts dtt eaa eab eac ead eae eam ear eas eat eba ebb ebc ebd ebe ebm ebr ebs ebt ec- eca ecb ecc ecd ece ecm ecr ecs ect ed- eda edb edc edd ede edm edr eds edt eea eeb eec eed eee eem eer ees eet em- ema emb emc emd eme emm emr ems emt era erb erc erd ere erm err ers ert es- esa esb esc esd ese esm esr ess est eta etb etc etd ete etm etr ets ett m-r maa mab mac mad mae mam mar mas mat mba mbb mbc mbd mbe mbm mbr mbs mbt mc- mca mcb mcc mcd mce mcm mcr mcs mct mda mdb mdc mdd mde mdm mdr mds mdt mea meb mec med mee mem mer mes met mma mmb mmc mmd mme mmm mmr mms mmt mra mrb mrc mrd mre mrm mrr mrs mrt msa msb msc msd mse msm msr mss mst mta mtb mtc mtd mte mtm mtr mts mtt ra- raa rab rac rad rae ram rar ras rat rba rbb rbc rbd rbe rbm rbr rbs rbt rca rcb rcc rcd rce rcm rcr rcs rct rda rdb rdc rdd rde rdm rdr rds rdt re- rea reb rec red ree rem rer res ret rma rmb rmc rmd rme rmm rmr rms rmt rra rrb rrc rrd rrm rrr rrs rrt rsa rsb rsc rsd rse rsm rsr rss rst rta rtb rtc rtd rte rtm rtr rts rtt saa sab sac sad sae sam sar sas sat sba sbb sbc sbd sbe sbm sbr sbs sbt sca scb scc scd sce scm scr scs sct sda sdb sdc sdd sde sdm sdr sds sdt se- sea seb sec sed see sem ser ses set sma smb smc smd sme smm smr sms smt sr- sra srb src srd sre srm srr srs srt ss- ssa ssb ssc ssd sse ssm ssr sss sst sta stb stc std ste stm str sts stt taa tab tac tad tae tam tar tas tat tba tbb tbc tbd tbe tbm tbr tbs tbt tca tcb tcc tcd tce tcm tcr tcs tct tda tdb tdc tdd tde tdm tdr tds tdt te- tea teb tec ted tee tem ter tes tet tma tmb tmc tmd tme tmm tmr tms tmt tra trb trc trd tre trm trr trs trt tsa tsb tsc tsd tse tsm tsr tss tst tta ttb ttc ttd tte ttm ttr tts ttt