-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aat aax ab- aba abb abc abi abk abt abx ac- aca acb acc aci ack act acx ai- aia aib aic aii aik ait aix aka akb akc aki akk at- ata atb atc ati att atx ax- axa axi axk axt axx baa bab bac bai bak bat bax bba bbb bbc bbi bbk bbt bbx bca bcb bcc bci bck bct bcx bi- bia bib bic bii bik bit bix bka bkb bkc bkk bkt bkx bta btb btc bti btk btt btx bxb bxi bxx c-- caa cab cac cai cak cat cax cba cbb cbc cbi cbk cbt cbx cca ccb ccc cci cck cct ccx ci- cia cib cic cii cik cit cix cka ckb ckc cki ckt ckx cta ctb ctc cti ctk ctt ctx cxc cxi cxk cxt cxx ia- iaa iab iac iai iat iba ibb ibc ibi ibk ibt ibx ica icb icc ici ick ict iia iib iic iii iit iix ika ikb ikc iki ikk ikt ikx ita itb itc iti itk itt itx ixc ixi k-t ka- kaa kab kac kai kak kat kax kba kbb kbc kbi kbk kbx kca kcb kcc kci kck kct kcx kia kib kic kii kik kit kix kkb kkc kki kkk kkt kta ktb ktc ktk ktt t-x taa tab tac tai tak tat tax tba tbb tbc tbi tbk tbt tca tcb tcc tci tck tct tcx tia tib tic tii tik tit tix tka tkb tkc tkk tkt tta ttb ttc tti ttk ttt ttx txi txk txt xaa xac xak xat xbc xbx xcb xci xcx xia xic xii xit xix xkb xtc xti xtx xxi xxx