-th a-a a-b a-c a-t aaa aab aac aah aak aat ab- aba abb abc abh abk abt ac- aca acb acc ach ack act aha ahb ahc ahh ahk aht aka akb akc akh akk at- ata atb atc ath att baa bab bac bah bak bat bba bbb bbc bbh bbk bbt bca bcb bcc bch bck bct bha bhb bhc bhh bhk bht bka bkb bkc bkk bkt bta btb btc bth btk btt c-- caa cab cac cah cak cat cba cbb cbc cbh cbk cbt cca ccb ccc cch cck cct ch- cha chb chc chh chk cht cka ckb ckc ckh ckt cta ctb ctc cth ctk ctt haa hab hac hah hak hat hba hbb hbc hbh hbk hbt hca hcb hcc hch hck hct hha hhb hhc hhh hhk hht hka hkb hkh hkk hkt hta htb htc hth htk htt k-t ka- kaa kab kac kah kak kat kba kbb kbc kbh kbk kca kcb kcc kch kck kct kha khh khk kkb kkc kkh kkk kkt kta ktb ktc kth ktk ktt taa tab tac tah tak tat tba tbb tbc tbh tbk tbt tca tcb tcc tch tck tct th- tha thb thc thh thk tht tka tkb tkc tkk tkt tta ttb ttc tth ttk ttt