-th a-a a-b a-c a-t aaa aab aac aah aat aax ab- aba abb abc abh abt abx ac- aca acb acc ach act acx aha ahb ahc ahh aht ahx at- ata atb atc ath att atx ax- axa axh axt axx baa bab bac bah bat bax bba bbb bbc bbh bbt bbx bca bcb bcc bch bct bcx bha bhb bhc bhh bht bhx bta btb btc bth btt btx bxb bxx c-- caa cab cac cah cat cax cba cbb cbc cbh cbt cbx cca ccb ccc cch cct ccx ch- cha chb chc chh cht chx cta ctb ctc cth ctt ctx cxc cxh cxt cxx haa hab hac hah hat hax hba hbb hbc hbh hbt hbx hca hcb hcc hch hct hha hhb hhc hhh hht hta htb htc hth htt htx hxc t-x taa tab tac tah tat tax tba tbb tbc tbh tbt tca tcb tcc tch tct tcx th- tha thb thc thh tht thx tta ttb ttc tth ttt ttx txt xaa xac xat xbc xbx xcb xch xcx xht xtc xtx xxx