-ic bbb bbc bbe bbi bbl bbt bcb bcc bce bci bcl bct be- beb bec bee bei bel bet bi- bib bic bie bii bil bit blb blc ble bli bll blt btb btc bte bti btl btt c-- cbb cbc cbe cbi cbl cbt ccb ccc cce cci ccl cct ce- ceb cec cee cei cel cet ci- cib cic cie cii cil cit cl- clb clc cle cli cll clt ctb ctc cte cti ctl ctt ebb ebc ebe ebi ebl ebt ec- ecb ecc ece eci ecl ect eeb eec eee eel eet eib eic eie eii eil eit elb elc ele eli ell elt etb etc ete eti etl ett ibb ibc ibe ibi ibl ibt icb icc ice ici icl ict ie- iec iee iei iel iet iib iic iie iii iil iit il- ilb ilc ile ili ill ilt itb itc ite iti itl itt lbb lbc lbe lbi lbl lbt lcb lcc lce lci lcl lct leb lec lee lei lel let lib lic lie lii lil lit llb llc lle lli lll llt ltb ltc lte lti ltl ltt tbb tbc tbe tbi tbl tbt tcb tcc tce tci tcl tct te- teb tec tee tei tel tet tib tic tie tii til tit tlc tle tli tll tlt ttb ttc tte tti ttl ttt