-er a-a a-b a-c a-t aaa aab aac aae aam aao aar aas aat ab- aba abb abc abe abm abo abr abs abt ac- aca acb acc ace acm aco acr acs act aea aeb aec aee aem aeo aer aes aet ama amb amc ame amm amo amr ams amt aoa aob aoc aoe aom aoo aor aos aot ar- ara arb arc are arm aro arr ars art as- asa asb asc ase asm aso asr ass ast at- ata atb atc ate atm ato atr ats att baa bab bac bae bam bao bar bas bat bba bbb bbc bbe bbm bbo bbr bbs bbt bca bcb bcc bce bcm bco bcr bcs bct be- bea beb bec bee bem beo ber bes bet bma bmb bmc bme bmm bmo bmr bms bmt boa bob boc boe bom boo bor bos bot bra brb bre brm bro brr brs brt bsa bsb bsc bse bsm bso bsr bss bst bta btb btc bte btm bto btr bts btt c-- caa cab cac cae cam cao car cas cat cba cbb cbc cbe cbm cbo cbr cbs cbt cca ccb ccc cce ccm cco ccr ccs cct ce- cea ceb cec cee cem ceo cer ces cet cma cmb cmc cme cmm cmo cmr cms cmt co- coa cob coc coe com coo cor cos cot cra crb crc cre crm cro crr crs crt csa csb csc cse csm cso csr css cst cta ctb ctc cte ctm cto ctr cts ctt eaa eab eac eae eam eao ear eas eat eba ebb ebc ebe ebm ebo ebr ebs ebt ec- eca ecb ecc ece ecm eco ecr ecs ect eea eeb eec eee eem eeo eer ees eet em- ema emb emc eme emm emo emr ems emt eo- eoa eob eoc eoe eom eoo eor eos eot era erb erc ere erm ero err ers ert es- esa esb esc ese esm eso esr ess est eta etb etc ete etm eto etr ets ett m-o m-r maa mab mac mae mam mao mar mas mat mba mbb mbc mbe mbm mbo mbr mbs mbt mc- mca mcb mcc mce mcm mco mcr mcs mct mea meb mec mee mem meo mer mes met mma mmb mmc mme mmm mmo mmr mms mmt moa mob moc moe mom moo mor mos mot mra mrb mrc mre mrm mro mrr mrs mrt msa msb msc mse msm mso msr mss mst mta mtb mtc mte mtm mto mtr mts mtt oaa oab oac oae oam oao oar oas oat ob- oba obb obc obe obm obo obr obs obt oc- oca ocb occ ocm oco ocr ocs oct oea oeb oec oee oem oeo oer oes oet om- oma omb omc ome omm omo omr oms omt oo- ooa oob ooc oom ooo oor oos oot or- ora orb orc ore orm oro orr ors ort os- osa osb osc ose osm oso osr oss ost ot- ota otb otc ote otm oto otr ots ott ra- raa rab rac rae ram rao rar ras rat rba rbb rbc rbe rbm rbo rbr rbs rbt rca rcb rcc rce rcm rco rcr rcs rct re- rea reb rec ree rem reo rer res ret rma rmb rmc rme rmm rmo rmr rms rmt roa rob roc roe rom roo ror ros rot rra rrb rrc rrm rrr rrs rrt rsa rsb rsc rse rsm rso rsr rss rst rta rtb rtc rte rtm rto rtr rts rtt saa sab sac sae sam sao sar sas sat sba sbb sbc sbe sbm sbo sbr sbs sbt sca scb scc sce scm sco scr scs sct se- sea seb sec see sem seo ser ses set sma smb smc sme smm smo smr sms smt soa sob soc soe som soo sor sos sot sr- sra srb src sre srm sro srr srs srt ss- ssa ssb ssc sse ssm sso ssr sss sst sta stb stc ste stm sto str sts stt taa tab tac tae tam tao tar tas tat tba tbb tbc tbe tbm tbo tbr tbs tbt tca tcb tcc tce tcm tco tcr tcs tct te- tea teb tec tee tem teo ter tes tet tma tmb tmc tme tmm tmo tmr tms tmt to- toa tob toc toe tom too tor tos tot tra trb trc tre trm tro trr trs trt tsa tsb tsc tse tsm tso tsr tss tst tta ttb ttc tte ttm tto ttr tts ttt