-ic bbb bbc bbe bbi bbk bbl bbs bbt bcb bcc bce bci bck bcl bcs bct be- beb bec bee bei bek bel bes bet bi- bib bic bie bii bik bil bis bit bkb bkc bke bkk bkl bks bkt blb blc ble bli blk bll bls blt bsb bsc bse bsi bsk bsl bss bst btb btc bte bti btk btl bts btt c-- cbb cbc cbe cbi cbk cbl cbs cbt ccb ccc cce cci cck ccl ccs cct ce- ceb cec cee cei cek cel ces cet ci- cib cic cie cii cik cil cis cit ckb ckc cki cks ckt cl- clb clc cle cli clk cll cls clt csb csc cse csi csk csl css cst ctb ctc cte cti ctk ctl cts ctt ebb ebc ebe ebi ebk ebl ebs ebt ec- ecb ecc ece eci eck ecl ecs ect eeb eec eee eek eel ees eet eib eic eie eii eik eil eis eit ekb ekc eke eki ekl eks ekt elb elc ele eli elk ell els elt es- esb esc ese esi esk esl ess est etb etc ete eti etk etl ets ett ibb ibc ibe ibi ibk ibl ibs ibt icb icc ice ici ick icl ics ict ie- iec iee iei iek iel ies iet iib iic iie iii iil iis iit ikb ikc ike iki ikk ikl iks ikt il- ilb ilc ile ili ilk ill ils ilt is- isb isc ise isi isk isl iss ist itb itc ite iti itk itl its itt k-t kbb kbc kbe kbi kbk kbl kbs kcb kcc kce kci kck kcl kcs kct ke- keb kec kee kei kek kel kes ket kib kic kie kii kik kil kis kit kkb kkc kke kki kkk kkl kks kkt kl- klb klc kli kls klt ksb ksc kse ksi ksk ksl kss kst ktb ktc kte ktk ktl kts ktt lbb lbc lbe lbi lbk lbl lbs lbt lcb lcc lce lci lck lcl lcs lct leb lec lee lei lek lel les let lib lic lie lii lik lil lis lit lkb lkl lks lkt llb llc lle lli llk lll lls llt lsb lsc lse lsi lsk lsl lss lst ltb ltc lte lti ltk ltl lts ltt sbb sbc sbe sbi sbk sbl sbs sbt scb scc sce sci sck scl scs sct se- seb sec see sei sek sel ses set sib sic sie sii sik sil sis sit sk- skb skc ske ski skk skl sks skt slb slc sle sli slk sll sls slt ss- ssb ssc sse ssi ssk ssl sss sst stb stc ste sti stk stl sts stt tbb tbc tbe tbi tbk tbl tbs tbt tcb tcc tce tci tck tcl tcs tct te- teb tec tee tei tek tel tes tet tib tic tie tii tik til tis tit tkb tkc tke tkk tkl tks tkt tlc tle tli tlk tll tls tlt tsb tsc tse tsi tsk tsl tss tst ttb ttc tte tti ttk ttl tts ttt