-er a-a a-b a-c a-t aaa aab aac aae aak aam aao aar aas aat ab- aba abb abc abe abk abm abo abr abs abt ac- aca acb acc ace ack acm aco acr acs act aea aeb aec aee aek aem aeo aer aes aet aka akb akc ake akk akm ako akr aks ama amb amc ame amk amm amo amr ams amt aoa aob aoc aoe aok aom aoo aor aos aot ar- ara arb arc are ark arm aro arr ars art as- asa asb asc ase ask asm aso asr ass ast at- ata atb atc ate atm ato atr ats att baa bab bac bae bak bam bao bar bas bat bba bbb bbc bbe bbk bbm bbo bbr bbs bbt bca bcb bcc bce bck bcm bco bcr bcs bct be- bea beb bec bee bek bem beo ber bes bet bka bkb bkc bke bkk bkm bko bkr bks bkt bma bmb bmc bme bmk bmm bmo bmr bms bmt boa bob boc boe bok bom boo bor bos bot bra brb bre brk brm bro brr brs brt bsa bsb bsc bse bsk bsm bso bsr bss bst bta btb btc bte btk btm bto btr bts btt c-- caa cab cac cae cak cam cao car cas cat cba cbb cbc cbe cbk cbm cbo cbr cbs cbt cca ccb ccc cce cck ccm cco ccr ccs cct ce- cea ceb cec cee cek cem ceo cer ces cet cka ckb ckc ckm cko cks ckt cma cmb cmc cme cmk cmm cmo cmr cms cmt co- coa cob coc coe cok com coo cor cos cot cra crb crc cre crk crm cro crr crs crt csa csb csc cse csk csm cso csr css cst cta ctb ctc cte ctk ctm cto ctr cts ctt eaa eab eac eae eak eam eao ear eas eat eba ebb ebc ebe ebk ebm ebo ebr ebs ebt ec- eca ecb ecc ece eck ecm eco ecr ecs ect eea eeb eec eee eek eem eeo eer ees eet eka ekb ekc eke eko ekr eks ekt em- ema emb emc eme emk emm emo emr ems emt eo- eoa eob eoc eoe eok eom eoo eor eos eot era erb erc ere erk erm ero err ers ert es- esa esb esc ese esk esm eso esr ess est eta etb etc ete etk etm eto etr ets ett k-t ka- kaa kab kac kae kak kam kao kar kas kat kba kbb kbc kbe kbk kbm kbo kbr kbs kca kcb kcc kce kck kcm kcr kcs kct ke- kea keb kec kee kek kem keo ker kes ket kkb kkc kke kkk kkm kkr kks kkt kma kmb kmc kme kmk kmm kmo kms kmt koa kob koc koe kok kom koo kor kos kot kra krc krk kro krr krs krt ksa ksb ksc kse ksk ksm kso ksr kss kst kta ktb ktc kte ktk ktm kto ktr kts ktt m-o m-r maa mab mac mae mak mam mao mar mas mat mba mbb mbc mbe mbk mbm mbo mbr mbs mbt mc- mca mcb mcc mce mck mcm mco mcr mcs mct mea meb mec mee mek mem meo mer mes met mka mkb mkc mke mkk mkm mko mkr mks mkt mma mmb mmc mme mmk mmm mmo mmr mms mmt moa mob moc moe mok mom moo mor mos mot mra mrb mrc mre mrk mrm mro mrr mrs mrt msa msb msc mse msk msm mso msr mss mst mta mtb mtc mte mtk mtm mto mtr mts mtt oaa oab oac oae oak oam oao oar oas oat ob- oba obb obc obe obk obm obo obr obs obt oc- oca ocb occ ock ocm oco ocr ocs oct oea oeb oec oee oem oeo oer oes oet oka okb okc oke okk oko okr oks om- oma omb omc ome omm omo omr oms omt oo- ooa oob ooc ook oom ooo oor oos oot or- ora orb orc ore ork orm oro orr ors ort os- osa osb osc ose osk osm oso osr oss ost ot- ota otb otc ote otk otm oto otr ots ott ra- raa rab rac rae rak ram rao rar ras rat rba rbb rbc rbe rbk rbm rbo rbr rbs rbt rca rcb rcc rce rcm rco rcr rcs rct re- rea reb rec ree rek rem reo rer res ret rkb rkc rke rkk rkm rko rks rkt rma rmb rmc rme rmm rmo rmr rms rmt roa rob roc roe rok rom roo ror ros rot rra rrb rrc rrk rrm rrr rrs rrt rsa rsb rsc rse rsk rsm rso rsr rss rst rta rtb rtc rte rtk rtm rto rtr rts rtt saa sab sac sae sak sam sao sar sas sat sba sbb sbc sbe sbk sbm sbo sbr sbs sbt sca scb scc sce sck scm sco scr scs sct se- sea seb sec see sek sem seo ser ses set sk- ska skb skc ske skk skm sko skr sks skt sma smb smc sme smk smm smo smr sms smt soa sob soc soe sok som soo sor sos sot sr- sra srb src sre srk srm sro srr srs srt ss- ssa ssb ssc sse ssk ssm sso ssr sss sst sta stb stc ste stk stm sto str sts stt taa tab tac tae tak tam tao tar tas tat tba tbb tbc tbe tbk tbm tbo tbr tbs tbt tca tcb tcc tce tck tcm tco tcr tcs tct te- tea teb tec tee tek tem teo ter tes tet tka tkb tkc tke tkk tkm tko tkr tks tkt tma tmb tmc tme tmk tmm tmo tmr tms tmt to- toa tob toc toe tok tom too tor tos tot tra trb trc tre trk trm tro trr trs trt tsa tsb tsc tse tsk tsm tso tsr tss