-ic bbb bbc bbe bbi bbk bbl bcb bcc bce bci bck bcl be- beb bec bee bei bek bel bi- bib bic bie bii bik bil bkb bkc bke bkk bkl blb blc ble bli blk bll c-- cbb cbc cbe cbi cbk cbl ccb ccc cce cci cck ccl ce- ceb cec cee cei cek cel ci- cib cic cie cii cik cil ckb ckc cki cl- clb clc cle cli clk cll ebb ebc ebe ebi ebk ebl ec- ecb ecc ece eci eck ecl eeb eec eee eek eel eib eic eie eii eik eil ekb ekc eke eki ekl elb elc ele eli elk ell ibb ibc ibe ibi ibk ibl icb icc ice ici ick icl ie- iec iee iei iek iel iib iic iie iii iil ikb ikc ike iki ikk ikl il- ilb ilc ile ili ilk ill kbb kbc kbe kbi kbk kbl kcb kcc kce kci kck kcl ke- keb kec kee kei kek kel kib kic kie kii kik kil kkb kkc kke kki kkk kkl kl- klb klc kli lbb lbc lbe lbi lbk lbl lcb lcc lce lci lck lcl leb lec lee lei lek lel lib lic lie lii lik lil lkb lkl llb llc lle lli llk lll