a-a a-b a-c a-t aaa aab aac aap aat ab- aba abb abc abp abt ac- aca acb acc acp act ap- apa apb apc app apt at- ata atb atc atp att b-p baa bab bac bap bat bba bbb bbc bbp bbt bca bcb bcc bcp bct bpa bpb bpc bpp bpt bta btb btc btp btt c-- caa cab cac cap cat cba cbb cbc cbp cbt cca ccb ccc ccp cct cpa cpb cpc cpp cpt cta ctb ctc ctp ctt p-p paa pab pac pap pat pba pbb pbc pbp pbt pca pcb pcc pcp pct ppa ppb ppc ppp ppt pt- pta ptb ptc ptp ptt taa tab tac tap tat tba tbb tbc tbp tbt tca tcb tcc tcp tct tpa tpb tpc tpp tpt tta ttb ttc ttp ttt