-ic bbb bbc bbe bbi bbk bbt bbx bcb bcc bce bci bck bct bcx be- beb bec bee bei bek bet bex bi- bib bic bie bii bik bit bix bkb bkc bke bkk bkt bkx btb btc bte bti btk btt btx bxb bxi bxx c-- cbb cbc cbe cbi cbk cbt cbx ccb ccc cce cci cck cct ccx ce- ceb cec cee cei cek cet cex ci- cib cic cie cii cik cit cix ckb ckc cki ckt ckx ctb ctc cte cti ctk ctt ctx cxc cxi cxk cxt cxx ebb ebc ebe ebi ebk ebt ebx ec- ecb ecc ece eci eck ect ecx eeb eec eee eek eet eex eib eic eie eii eik eit eix ekb ekc eke eki ekt etb etc ete eti etk ett etx ex- exc exe exi ext exx ibb ibc ibe ibi ibk ibt ibx icb icc ice ici ick ict ie- iec iee iei iek iet iex iib iic iie iii iit iix ikb ikc ike iki ikk ikt ikx itb itc ite iti itk itt itx ixc ixe ixi k-t kbb kbc kbe kbi kbk kbx kcb kcc kce kci kck kct kcx ke- keb kec kee kei kek ket kex kib kic kie kii kik kit kix kkb kkc kke kki kkk kkt ktb ktc kte ktk ktt t-x tbb tbc tbe tbi tbk tbt tcb tcc tce tci tck tct tcx te- teb tec tee tei tek tet tex tib tic tie tii tik tit tix tkb tkc tke tkk tkt ttb ttc tte tti ttk ttt ttx txe txi txk txt xbc xbe xbx xcb xci xcx xee xet xex xic xie xii xit xix xkb xke xtc xti xtx xxi xxx