a-a a-b a-c a-t aaa aab aac aae aap aat ab- aba abb abc abe abp abt ac- aca acb acc ace acp act aea aeb aec aee aep aet ap- apa apb apc ape app apt at- ata atb atc ate atp att b-p baa bab bac bae bap bat bba bbb bbc bbe bbp bbt bca bcb bcc bce bcp bct be- bea beb bec bee bep bet bpa bpb bpc bpe bpp bpt bta btb btc bte btp btt c-- caa cab cac cae cap cat cba cbb cbc cbe cbp cbt cca ccb ccc cce ccp cct ce- cea ceb cec cee cep cet cpa cpb cpc cpe cpp cpt cta ctb ctc cte ctp ctt eaa eab eac eae eap eat eba ebb ebc ebe ebp ebt ec- eca ecb ecc ece ect eea eeb eec eee eep eet ep- epa epb epc epe epp ept eta etb etc ete etp ett p-p paa pab pac pae pap pat pba pbb pbc pbe pbp pbt pca pcb pcc pce pcp pct pea peb pec pee pep pet ppa ppb ppc ppe ppp ppt pt- pta ptb ptc pte ptp ptt taa tab tac tae tap tat tba tbb tbc tbe tbp tbt tca tcb tcc tce tcp tct te- tea teb tec tee tep tet tpa tpb tpc tpe tpp tpt tta ttb ttc tte ttp ttt