-ic bbb bbc bbi bbk bbs bby bcb bcc bci bck bcs bcy bi- bib bic bii bik bis biy bkb bkc bkk bks bsb bsc bsi bsk bss bsy by- byc byi byk bys c-- cbb cbc cbi cbk cbs cby ccb ccc cci cck ccs ci- cib cic cii cik cis ckb ckc cki cks cky csb csc csi csk css csy cyb cyc cyk cys ibb ibc ibi ibk ibs iby icb icc ici ick ics icy iib iic iii iis ikb ikc iki ikk iks is- isb isc isi isk iss isy iyc iys iyy kbb kbc kbi kbk kbs kcb kcc kci kck kcs kib kic kii kik kis kkb kkc kki kkk kks kky ksb ksc ksi ksk kss kyc kys sbb sbc sbi sbk sbs sby scb scc sci sck scs sib sic sii sik sis sk- skb skc ski skk sks sky ss- ssb ssc ssi ssk sss sy- syb syc syi syk sys ybc ybi ybs yby ycc yci ycs ycy yii yis yki ykk ysb ysc ysi ysk yss ysy yyb yyc yys yyy