-ic b-u bbb bbc bbi bbk bbs bbt bbu bcb bcc bci bck bcs bct bcu bi- bib bic bii bik bis bit biu bkb bkc bkk bks bkt bsb bsc bsi bsk bss bst bsu btb btc bti btk bts btt btu bub buc bui buk bus but buu c-- cbb cbc cbi cbk cbs cbt cbu ccb ccc cci cck ccs cct ccu ci- cib cic cii cik cis cit ciu ckb ckc cki cks ckt csb csc csi csk css cst csu ctb ctc cti ctk cts ctt ctu cub cuc cui cuk cus cut cuu ibb ibc ibi ibk ibs ibt ibu icb icc ici ick ics ict icu iib iic iii iis iit iiu ikb ikc iki ikk iks ikt iku is- isb isc isi isk iss ist isu itb itc iti itk its itt itu iu- iub iuc iui ius iut k-t kbb kbc kbi kbk kbs kbu kcb kcc kci kck kcs kct kcu kib kic kii kik kis kit kiu kkb kkc kki kkk kks kkt kku ksb ksc ksi ksk kss kst ksu ktb ktc ktk kts ktt ktu kub kuc kui kuk kus kut kuu sbb sbc sbi sbk sbs sbt sbu scb scc sci sck scs sct scu sib sic sii sik sis sit siu sk- skb skc ski skk sks skt sku ss- ssb ssc ssi ssk sss sst ssu stb stc sti stk sts stt stu sub suc sui suk sus sut suu tbb tbc tbi tbk tbs tbt tbu tcb tcc tci tck tcs tct tcu tib tic tii tik tis tit tiu tkb tkc tkk tks tkt tsb tsc tsi tsk tss tst tsu ttb ttc tti ttk tts ttt ttu tub tuc tui tuk tus tut tuu ubb ubc ubi ubk ubs ubt ubu ucb ucc uci uck ucs uct ucu uib uic uii uis uit uiu ukb ukc uki ukk uku usb usc usi usk uss ust usu utb utc uti utk uts utt utu uuc uus uut uuu