-ic b-u bbb bbc bbi bbt bbu bby bcb bcc bci bct bcu bcy bi- bib bic bii bit biu biy btb btc bti btt btu bty bub buc bui but buu buy by- byc byi byt byu c-- cbb cbc cbi cbt cbu cby ccb ccc cci cct ccu ci- cib cic cii cit ciu ctb ctc cti ctt ctu cty cub cuc cui cut cuu cuy cyb cyc cyt ibb ibc ibi ibt ibu iby icb icc ici ict icu icy iib iic iii iit iiu itb itc iti itt itu ity iu- iub iuc iui iut iyc iyt iyy tbb tbc tbi tbt tbu tcb tcc tci tct tcu tib tic tii tit tiu tiy ttb ttc tti ttt ttu tty tub tuc tui tut tuu tuy tyc tyt ubb ubc ubi ubt ubu uby ucb ucc uci uct ucu uib uic uii uit uiu utb utc uti utt utu uty uuc uut uuu uyc uyi uyu ybc ybi yby ycc yci ycu ycy yii yit ytc ytt ytu yui yut yuu yuy yyb yyc yyt yyu yyy