-ic b-u bbb bbc bbi bbu bby bcb bcc bci bcu bcy bi- bib bic bii biu biy bub buc bui buu buy by- byc byi byu c-- cbb cbc cbi cbu cby ccb ccc cci ccu ci- cib cic cii ciu cub cuc cui cuu cuy cyb cyc ibb ibc ibi ibu iby icb icc ici icu icy iib iic iii iiu iu- iub iuc iui iyc iyy ubb ubc ubi ubu uby ucb ucc uci ucu uib uic uii uiu uuc uuu uyc uyi uyu ybc ybi yby ycc yci ycu ycy yii yui yuu yuy yyb yyc yyu yyy