-th bbb bbc bbe bbh bbk bbt bcb bcc bce bch bck bct be- beb bec bee beh bek bet bhb bhc bhe bhh bhk bht bkb bkc bke bkk bkt btb btc bte bth btk btt c-- cbb cbc cbe cbh cbk cbt ccb ccc cce cch cck cct ce- ceb cec cee ceh cek cet ch- chb chc che chh chk cht ckb ckc ckh ckt ctb ctc cte cth ctk ctt ebb ebc ebe ebh ebk ebt ec- ecb ecc ece ech eck ect eeb eec eee eek eet ehb ehc ehe ehh eht ekb ekc eke ekh ekt etb etc ete eth etk ett hbb hbc hbe hbh hbk hbt hcb hcc hce hch hck hct he- heb hec hee heh hek het hhb hhc hhe hhh hhk hht hkb hkh hkk hkt htb htc hte hth htk htt k-t kbb kbc kbe kbh kbk kcb kcc kce kch kck kct ke- keb kec kee keh kek ket khe khh khk kkb kkc kke kkh kkk kkt ktb ktc kte kth ktk ktt tbb tbc tbe tbh tbk tbt tcb tcc tce tch tck tct te- teb tec tee teh tek tet th- thb thc the thh thk tht tkb tkc tke tkk tkt ttb ttc tte tth ttk ttt