-ic bbb bbc bbi bbk bbs bbt bby bcb bcc bci bck bcs bct bcy bi- bib bic bii bik bis bit biy bkb bkc bkk bks bkt bsb bsc bsi bsk bss bst bsy btb btc bti btk bts btt bty by- byc byi byk bys byt c-- cbb cbc cbi cbk cbs cbt cby ccb ccc cci cck ccs cct ci- cib cic cii cik cis cit ckb ckc cki cks ckt cky csb csc csi csk css cst csy ctb ctc cti ctk cts ctt cty cyb cyc cyk cys cyt ibb ibc ibi ibk ibs ibt iby icb icc ici ick ics ict icy iib iic iii iis iit ikb ikc iki ikk iks ikt is- isb isc isi isk iss ist isy itb itc iti itk its itt ity iyc iys iyt iyy k-t kbb kbc kbi kbk kbs kcb kcc kci kck kcs kct kib kic kii kik kis kit kkb kkc kki kkk kks kkt kky ksb ksc ksi ksk kss kst ktb ktc ktk kts ktt kyc kys kyt sbb sbc sbi sbk sbs sbt sby scb scc sci sck scs sct sib sic sii sik sis sit sk- skb skc ski skk sks skt sky ss- ssb ssc ssi ssk sss sst stb stc sti stk sts stt sty sy- syb syc syi syk sys syt tbb tbc tbi tbk tbs tbt tcb tcc tci tck tcs tct tib tic tii tik tis tit tiy tkb tkc tkk tks tkt tky tsb tsc tsi tsk tss tst tsy ttb ttc tti ttk tts ttt tty tyc tys tyt ybc ybi ybs yby ycc yci ycs ycy yii yis yit yki ykk ysb ysc ysi ysk yss yst ysy ytc ytk yts ytt yyb yyc yys yyt yyy