a-a a-b a-c a-t aaa aab aac aae aam aao aat ab- aba abb abc abe abm abo abt ac- aca acb acc ace acm aco act aea aeb aec aee aem aeo aet ama amb amc ame amm amo amt aoa aob aoc aoe aom aoo aot at- ata atb atc ate atm ato att baa bab bac bae bam bao bat bba bbb bbc bbe bbm bbo bbt bca bcb bcc bce bcm bco bct be- bea beb bec bee bem beo bet bma bmb bmc bme bmm bmo bmt boa bob boc boe bom boo bot bta btb btc bte btm bto btt c-- caa cab cac cae cam cao cat cba cbb cbc cbe cbm cbo cbt cca ccb ccc cce ccm cco cct ce- cea ceb cec cee cem ceo cet cma cmb cmc cme cmm cmo cmt co- coa cob coc coe com coo cot cta ctb ctc cte ctm cto ctt eaa eab eac eae eam eao eat eba ebb ebc ebe ebm ebo ebt ec- eca ecb ecc ece ecm eco ect eea eeb eec eee eem eeo eet em- ema emb emc eme emm emo emt eo- eoa eob eoc eoe eom eoo eot eta etb etc ete etm eto ett m-o maa mab mac mae mam mao mat mba mbb mbc mbe mbm mbo mbt mc- mca mcb mcc mce mcm mco mct mea meb mec mee mem meo met mma mmb mmc mme mmm mmo mmt moa mob moc moe mom moo mot mta mtb mtc mte mtm mto mtt oaa oab oac oae oam oao oat ob- oba obb obc obe obm obo obt oc- oca ocb occ ocm oco oct oea oeb oec oee oem oeo oet om- oma omb omc ome omm omo omt oo- ooa oob ooc oom ooo oot ot- ota otb otc ote otm oto ott taa tab tac tae tam tao tat tba tbb tbc tbe tbm tbo tbt tca tcb tcc tce tcm tco tct te- tea teb tec tee tem teo tet tma tmb tmc tme tmm tmo tmt to- toa tob toc toe tom too tot tta ttb ttc tte ttm tto ttt