a-a a-b a-c a-t aaa aab aac aae aak aam aao aas aat ab- aba abb abc abe abk abm abo abs abt ac- aca acb acc ace ack acm aco acs act aea aeb aec aee aek aem aeo aes aet aka akb akc ake akk akm ako aks ama amb amc ame amk amm amo ams amt aoa aob aoc aoe aok aom aoo aos aot as- asa asb asc ase ask asm aso ass ast at- ata atb atc ate atm ato ats att baa bab bac bae bak bam bao bas bat bba bbb bbc bbe bbk bbm bbo bbs bbt bca bcb bcc bce bck bcm bco bcs bct be- bea beb bec bee bek bem beo bes bet bka bkb bkc bke bkk bkm bko bks bkt bma bmb bmc bme bmk bmm bmo bms bmt boa bob boc boe bok bom boo bos bot bsa bsb bsc bse bsk bsm bso bss bst bta btb btc bte btk btm bto bts btt c-- caa cab cac cae cak cam cao cas cat cba cbb cbc cbe cbk cbm cbo cbs cbt cca ccb ccc cce cck ccm cco ccs cct ce- cea ceb cec cee cek cem ceo ces cet cka ckb ckc ckm cko cks ckt cma cmb cmc cme cmk cmm cmo cms cmt co- coa cob coc coe cok com coo cos cot csa csb csc cse csk csm cso css cst cta ctb ctc cte ctk ctm cto cts ctt eaa eab eac eae eak eam eao eas eat eba ebb ebc ebe ebk ebm ebo ebs ebt ec- eca ecb ecc ece eck ecm eco ecs ect eea eeb eec eee eek eem eeo ees eet eka ekb ekc eke eko eks ekt em- ema emb emc eme emk emm emo ems emt eo- eoa eob eoc eoe eok eom eoo eos eot es- esa esb esc ese esk esm eso ess est eta etb etc ete etk etm eto ets ett k-t ka- kaa kab kac kae kak kam kao kas kat kba kbb kbc kbe kbk kbm kbo kbs kca kcb kcc kce kck kcm kcs kct ke- kea keb kec kee kek kem keo kes ket kkb kkc kke kkk kkm kks kkt kma kmb kmc kme kmk kmm kmo kms kmt koa kob koc koe kok kom koo kos kot ksa ksb ksc kse ksk ksm kso kss kst kta ktb ktc kte ktk ktm kto kts ktt m-o maa mab mac mae mak mam mao mas mat mba mbb mbc mbe mbk mbm mbo mbs mbt mc- mca mcb mcc mce mck mcm mco mcs mct mea meb mec mee mek mem meo mes met mka mkb mkc mke mkk mkm mko mks mkt mma mmb mmc mme mmk mmm mmo mms mmt moa mob moc moe mok mom moo mos mot msa msb msc mse msk msm mso mss mst mta mtb mtc mte mtk mtm mto mts mtt oaa oab oac oae oak oam oao oas oat ob- oba obb obc obe obk obm obo obs obt oc- oca ocb occ ock ocm oco ocs oct oea oeb oec oee oem oeo oes oet oka okb okc oke okk oko oks om- oma omb omc ome omm omo oms omt oo- ooa oob ooc ook oom ooo oos oot os- osa osb osc ose osk osm oso oss ost ot- ota otb otc ote otk otm oto ots ott saa sab sac sae sak sam sao sas sat sba sbb sbc sbe sbk sbm sbo sbs sbt sca scb scc sce sck scm sco scs sct se- sea seb sec see sek sem seo ses set sk- ska skb skc ske skk skm sko sks skt sma smb smc sme smk smm smo sms smt soa sob soc soe sok som soo sos sot ss- ssa ssb ssc sse ssk ssm sso sss sst sta stb stc ste stk stm sto sts stt taa tab tac tae tak tam tao tas tat tba tbb tbc tbe tbk tbm tbo tbs tbt tca tcb tcc tce tck tcm tco tcs tct te- tea teb tec tee tek tem teo tes tet tka tkb tkc tke tkk tkm tko tks tkt tma tmb tmc tme tmk tmm tmo tms tmt to- toa tob toc toe tok tom too tos tot tsa tsb tsc tse tsk tsm tso tss tst tta ttb ttc tte ttk ttm tto tts ttt