-ic bbb bbc bbe bbi bbk bbl bbs bcb bcc bce bci bck bcl bcs be- beb bec bee bei bek bel bes bi- bib bic bie bii bik bil bis bkb bkc bke bkk bkl bks blb blc ble bli blk bll bls bsb bsc bse bsi bsk bsl bss c-- cbb cbc cbe cbi cbk cbl cbs ccb ccc cce cci cck ccl ccs ce- ceb cec cee cei cek cel ces ci- cib cic cie cii cik cil cis ckb ckc cki cks cl- clb clc cle cli clk cll cls csb csc cse csi csk csl css ebb ebc ebe ebi ebk ebl ebs ec- ecb ecc ece eci eck ecl ecs eeb eec eee eek eel ees eib eic eie eii eik eil eis ekb ekc eke eki ekl eks elb elc ele eli elk ell els es- esb esc ese esi esk esl ess ibb ibc ibe ibi ibk ibl ibs icb icc ice ici ick icl ics ie- iec iee iei iek iel ies iib iic iie iii iil iis ikb ikc ike iki ikk ikl iks il- ilb ilc ile ili ilk ill ils is- isb isc ise isi isk isl iss kbb kbc kbe kbi kbk kbl kbs kcb kcc kce kci kck kcl kcs ke- keb kec kee kei kek kel kes kib kic kie kii kik kil kis kkb kkc kke kki kkk kkl kks kl- klb klc kli kls ksb ksc kse ksi ksk ksl kss lbb lbc lbe lbi lbk lbl lbs lcb lcc lce lci lck lcl lcs leb lec lee lei lek lel les lib lic lie lii lik lil lis lkb lkl lks llb llc lle lli llk lll lls lsb lsc lse lsi lsk lsl lss sbb sbc sbe sbi sbk sbl sbs scb scc sce sci sck scl scs se- seb sec see sei sek sel ses sib sic sie sii sik sil sis sk- skb skc ske ski skk skl sks slb slc sle sli slk sll sls ss- ssb ssc sse ssi ssk ssl sss