-ic b-u bbb bbc bbe bbi bbk bbs bbt bbu bcb bcc bce bci bck bcs bct bcu be- beb bec bee bei bek bes bet beu bi- bib bic bie bii bik bis bit biu bkb bkc bke bkk bks bkt bsb bsc bse bsi bsk bss bst bsu btb btc bte bti btk bts btt btu bub buc bue bui buk bus but buu c-- cbb cbc cbe cbi cbk cbs cbt cbu ccb ccc cce cci cck ccs cct ccu ce- ceb cec cee cei cek ces cet ceu ci- cib cic cie cii cik cis cit ciu ckb ckc cki cks ckt csb csc cse csi csk css cst csu ctb ctc cte cti ctk cts ctt ctu cub cuc cue cui cuk cus cut cuu ebb ebc ebe ebi ebk ebs ebt ebu ec- ecb ecc ece eci eck ecs ect ecu eeb eec eee eek ees eet eib eic eie eii eik eis eit eiu ekb ekc eke eki eks ekt eku es- esb esc ese esi esk ess est esu etb etc ete eti etk ets ett etu eu- eub euc eue eui eus eut ibb ibc ibe ibi ibk ibs ibt ibu icb icc ice ici ick ics ict icu ie- iec iee iei iek ies iet iib iic iie iii iis iit iiu ikb ikc ike iki ikk iks ikt iku is- isb isc ise isi isk iss ist isu itb itc ite iti itk its itt itu iu- iub iuc iue iui ius iut k-t kbb kbc kbe kbi kbk kbs kbu kcb kcc kce kci kck kcs kct kcu ke- keb kec kee kei kek kes ket kib kic kie kii kik kis kit kiu kkb kkc kke kki kkk kks kkt kku ksb ksc kse ksi ksk kss kst ksu ktb ktc kte ktk kts ktt ktu kub kuc kue kui kuk kus kut kuu sbb sbc sbe sbi sbk sbs sbt sbu scb scc sce sci sck scs sct scu se- seb sec see sei sek ses set seu sib sic sie sii sik sis sit siu sk- skb skc ske ski skk sks skt sku ss- ssb ssc sse ssi ssk sss sst ssu stb stc ste sti stk sts stt stu sub suc sue sui suk sus sut suu tbb tbc tbe tbi tbk tbs tbt tbu tcb tcc tce tci tck tcs tct tcu te- teb tec tee tei tek tes tet teu tib tic tie tii tik tis tit tiu tkb tkc tke tkk tks tkt tsb tsc tse tsi tsk tss tst tsu ttb ttc tte tti ttk tts ttt ttu tub tuc tue tui tuk tus tut tuu ubb ubc ube ubi ubk ubs ubt ubu ucb ucc uce uci uck ucs uct ucu ueb uec uee uei ues uet uib uic uie uii uis uit uiu ukb ukc uke uki ukk uku usb usc use usi usk uss ust usu utb utc ute uti utk uts utt utu uuc uue uus uut uuu