-ic b-u bbb bbc bbi bbs bbu bby bcb bcc bci bcs bcu bcy bi- bib bic bii bis biu biy bsb bsc bsi bss bsu bsy bub buc bui bus buu buy by- byc byi bys byu c-- cbb cbc cbi cbs cbu cby ccb ccc cci ccs ccu ci- cib cic cii cis ciu csb csc csi css csu csy cub cuc cui cus cuu cuy cyb cyc cys ibb ibc ibi ibs ibu iby icb icc ici ics icu icy iib iic iii iis iiu is- isb isc isi iss isu isy iu- iub iuc iui ius iyc iys iyy sbb sbc sbi sbs sbu sby scb scc sci scs scu sib sic sii sis siu ss- ssb ssc ssi sss ssu sub suc sui sus suu suy sy- syb syc syi sys syu ubb ubc ubi ubs ubu uby ucb ucc uci ucs ucu uib uic uii uis uiu usb usc usi uss usu uuc uus uuu uyc uyi uys uyu ybc ybi ybs yby ycc yci ycs ycu ycy yii yis ysb ysc ysi yss ysu ysy yui yus yuu yuy yyb yyc yys yyu yyy