a-a a-b a-c a-t aaa aab aac aae aam aat ab- aba abb abc abe abm abt ac- aca acb acc ace acm act aea aeb aec aee aem aet ama amb amc ame amm amt at- ata atb atc ate atm att baa bab bac bae bam bat bba bbb bbc bbe bbm bbt bca bcb bcc bce bcm bct be- bea beb bec bee bem bet bma bmb bmc bme bmm bmt bta btb btc bte btm btt c-- caa cab cac cae cam cat cba cbb cbc cbe cbm cbt cca ccb ccc cce ccm cct ce- cea ceb cec cee cem cet cma cmb cmc cme cmm cmt cta ctb ctc cte ctm ctt eaa eab eac eae eam eat eba ebb ebc ebe ebm ebt ec- eca ecb ecc ece ecm ect eea eeb eec eee eem eet em- ema emb emc eme emm emt eta etb etc ete etm ett maa mab mac mae mam mat mba mbb mbc mbe mbm mbt mc- mca mcb mcc mce mcm mct mea meb mec mee mem met mma mmb mmc mme mmm mmt mta mtb mtc mte mtm mtt taa tab tac tae tam tat tba tbb tbc tbe tbm tbt tca tcb tcc tce tcm tct te- tea teb tec tee tem tet tma tmb tmc tme tmm tmt tta ttb ttc tte ttm ttt