a-a a-b a-c a-t aaa aab aac aae aak aam aao aat ab- aba abb abc abe abk abm abo abt ac- aca acb acc ace ack acm aco act aea aeb aec aee aek aem aeo aet aka akb akc ake akk akm ako ama amb amc ame amk amm amo amt aoa aob aoc aoe aok aom aoo aot at- ata atb atc ate atm ato att baa bab bac bae bak bam bao bat bba bbb bbc bbe bbk bbm bbo bbt bca bcb bcc bce bck bcm bco bct be- bea beb bec bee bek bem beo bet bka bkb bkc bke bkk bkm bko bkt bma bmb bmc bme bmk bmm bmo bmt boa bob boc boe bok bom boo bot bta btb btc bte btk btm bto btt c-- caa cab cac cae cak cam cao cat cba cbb cbc cbe cbk cbm cbo cbt cca ccb ccc cce cck ccm cco cct ce- cea ceb cec cee cek cem ceo cet cka ckb ckc ckm cko ckt cma cmb cmc cme cmk cmm cmo cmt co- coa cob coc coe cok com coo cot cta ctb ctc cte ctk ctm cto ctt eaa eab eac eae eak eam eao eat eba ebb ebc ebe ebk ebm ebo ebt ec- eca ecb ecc ece eck ecm eco ect eea eeb eec eee eek eem eeo eet eka ekb ekc eke eko ekt em- ema emb emc eme emk emm emo emt eo- eoa eob eoc eoe eok eom eoo eot eta etb etc ete etk etm eto ett k-t ka- kaa kab kac kae kak kam kao kat kba kbb kbc kbe kbk kbm kbo kca kcb kcc kce kck kcm kct ke- kea keb kec kee kek kem keo ket kkb kkc kke kkk kkm kkt kma kmb kmc kme kmk kmm kmo kmt koa kob koc koe kok kom koo kot kta ktb ktc kte ktk ktm kto ktt m-o maa mab mac mae mak mam mao mat mba mbb mbc mbe mbk mbm mbo mbt mc- mca mcb mcc mce mck mcm mco mct mea meb mec mee mek mem meo met mka mkb mkc mke mkk mkm mko mkt mma mmb mmc mme mmk mmm mmo mmt moa mob moc moe mok mom moo mot mta mtb mtc mte mtk mtm mto mtt oaa oab oac oae oak oam oao oat ob- oba obb obc obe obk obm obo obt oc- oca ocb occ ock ocm oco oct oea oeb oec oee oem oeo oet oka okb okc oke okk oko om- oma omb omc ome omm omo omt oo- ooa oob ooc ook oom ooo oot ot- ota otb otc ote otk otm oto ott taa tab tac tae tak tam tao tat tba tbb tbc tbe tbk tbm tbo tbt tca tcb tcc tce tck tcm tco tct te- tea teb tec tee tek tem teo tet tka tkb tkc tke tkk tkm tko tkt tma tmb tmc tme tmk tmm tmo tmt to- toa tob toc toe tok tom too tot tta ttb ttc tte ttk ttm tto ttt