-ic b-u bbb bbc bbe bbi bbk bbl bbs bbu bcb bcc bce bci bck bcl bcs bcu be- beb bec bee bei bek bel bes beu bi- bib bic bie bii bik bil bis biu bkb bkc bke bkk bkl bks blb blc ble bli blk bll bls blu bsb bsc bse bsi bsk bsl bss bsu bub buc bue bui buk bul bus buu c-- cbb cbc cbe cbi cbk cbl cbs cbu ccb ccc cce cci cck ccl ccs ccu ce- ceb cec cee cei cek cel ces ceu ci- cib cic cie cii cik cil cis ciu ckb ckc cki cks cl- clb clc cle cli clk cll cls clu csb csc cse csi csk csl css csu cub cuc cue cui cuk cul cus cuu ebb ebc ebe ebi ebk ebl ebs ebu ec- ecb ecc ece eci eck ecl ecs ecu eeb eec eee eek eel ees eib eic eie eii eik eil eis eiu ekb ekc eke eki ekl eks eku elb elc ele eli elk ell els elu es- esb esc ese esi esk esl ess esu eu- eub euc eue eui eul eus ibb ibc ibe ibi ibk ibl ibs ibu icb icc ice ici ick icl ics icu ie- iec iee iei iek iel ies iib iic iie iii iil iis iiu ikb ikc ike iki ikk ikl iks iku il- ilb ilc ile ili ilk ill ils ilu is- isb isc ise isi isk isl iss isu iu- iub iuc iue iui ius kbb kbc kbe kbi kbk kbl kbs kbu kcb kcc kce kci kck kcl kcs kcu ke- keb kec kee kei kek kel kes kib kic kie kii kik kil kis kiu kkb kkc kke kki kkk kkl kks kku kl- klb klc kli kls klu ksb ksc kse ksi ksk ksl kss ksu kub kuc kue kui kuk kul kus kuu lbb lbc lbe lbi lbk lbl lbs lbu lcb lcc lce lci lck lcl lcs lcu leb lec lee lei lek lel les leu lib lic lie lii lik lil lis liu lkb lkl lks llb llc lle lli llk lll lls llu lsb lsc lse lsi lsk lsl lss lsu lub luc lue lui luk lul lus luu sbb sbc sbe sbi sbk sbl sbs sbu scb scc sce sci sck scl scs scu se- seb sec see sei sek sel ses seu sib sic sie sii sik sil sis siu sk- skb skc ske ski skk skl sks sku slb slc sle sli slk sll sls slu ss- ssb ssc sse ssi ssk ssl sss ssu sub suc sue sui suk sul sus suu ubb ubc ube ubi ubk ubl ubs ubu ucb ucc uce uci uck ucl ucs ucu ueb uec uee uei uel ues uib uic uie uii uil uis uiu ukb ukc uke uki ukk ukl uku ulb ulc ule uli ulk ull uls ulu usb usc use usi usk usl uss usu uuc uue uus uuu