-ic bbb bbc bbe bbi bbl bbs bbt bcb bcc bce bci bcl bcs bct be- beb bec bee bei bel bes bet bi- bib bic bie bii bil bis bit blb blc ble bli bll bls blt bsb bsc bse bsi bsl bss bst btb btc bte bti btl bts btt c-- cbb cbc cbe cbi cbl cbs cbt ccb ccc cce cci ccl ccs cct ce- ceb cec cee cei cel ces cet ci- cib cic cie cii cil cis cit cl- clb clc cle cli cll cls clt csb csc cse csi csl css cst ctb ctc cte cti ctl cts ctt ebb ebc ebe ebi ebl ebs ebt ec- ecb ecc ece eci ecl ecs ect eeb eec eee eel ees eet eib eic eie eii eil eis eit elb elc ele eli ell els elt es- esb esc ese esi esl ess est etb etc ete eti etl ets ett ibb ibc ibe ibi ibl ibs ibt icb icc ice ici icl ics ict ie- iec iee iei iel ies iet iib iic iie iii iil iis iit il- ilb ilc ile ili ill ils ilt is- isb isc ise isi isl iss ist itb itc ite iti itl its itt lbb lbc lbe lbi lbl lbs lbt lcb lcc lce lci lcl lcs lct leb lec lee lei lel les let lib lic lie lii lil lis lit llb llc lle lli lll lls llt lsb lsc lse lsi lsl lss lst ltb ltc lte lti ltl lts ltt sbb sbc sbe sbi sbl sbs sbt scb scc sce sci scl scs sct se- seb sec see sei sel ses set sib sic sie sii sil sis sit slb slc sle sli sll sls slt ss- ssb ssc sse ssi ssl sss sst stb stc ste sti stl sts stt tbb tbc tbe tbi tbl tbs tbt tcb tcc tce tci tcl tcs tct te- teb tec tee tei tel tes tet tib tic tie tii til tis tit tlc tle tli tll tls tlt tsb tsc tse tsi tsl tss tst ttb ttc tte tti ttl tts ttt