-ic b-u bbb bbc bbi bbr bbt bbu bby bcb bcc bci bcr bct bcu bcy bi- bib bic bii bir bit biu biy brb bri brr brt bru bry btb btc bti btr btt btu bty bub buc bui bur but buu buy by- byc byi byr byt byu c-- cbb cbc cbi cbr cbt cbu cby ccb ccc cci ccr cct ccu ci- cib cic cii cir cit ciu crb crc cri crr crt cru cry ctb ctc cti ctr ctt ctu cty cub cuc cui cur cut cuu cuy cyb cyc cyr cyt ibb ibc ibi ibr ibt ibu iby icb icc ici icr ict icu icy iib iic iii iir iit iiu ir- irb irc iri irr irt iru iry itb itc iti itt itu ity iu- iub iuc iui iur iut iyc iyr iyt iyy rbb rbc rbi rbr rbt rbu rcb rcc rci rcr rct rcu rib ric rii rir rit riy rrb rrc rri rrr rrt rru rtb rtc rti rtr rtt rtu rty rub ruc rui rur rut ruu ruy ry- ryc ryr ryu ryy tbb tbc tbi tbr tbt tbu tcb tcc tci tcr tct tcu tib tic tii tir tit tiu tiy trb trc tri trr trt tru try ttb ttc tti ttr ttt ttu tty tub tuc tui tur tut tuu tuy tyc tyr tyt ubb ubc ubi ubr ubt ubu uby ucb ucc uci ucr uct ucu uib uic uii uir uit uiu ur- urb urc uri urr urt uru ury utb utc uti utr utt utu uty uuc uur uut uuu uyc uyi uyu ybc ybi ybr yby ycc yci ycu ycy yii yir yit yrc yrt yru ytc ytr ytt ytu yui yur yut yuu yuy yyb yyc yyt yyu yyy