-ic bbb bbc bbd bbi bbr bbt bby bcb bcc bcd bci bcr bct bcy bdb bdc bdd bdi bdr bdt bdy bi- bib bic bid bii bir bit biy brb brd bri brr brt bry btb btc btd bti btr btt bty by- byc byd byi byr byt c-- cbb cbc cbd cbi cbr cbt cby ccb ccc ccd cci ccr cct cdb cdc cdd cdi cdr cdt cdy ci- cib cic cid cii cir cit crb crc crd cri crr crt cry ctb ctc ctd cti ctr ctt cty cyb cyc cyd cyr cyt dbb dbc dbd dbi dbr dbt dby dcb dcc dcd dci dcr dct ddb ddc ddd ddi ddr ddt ddy di- dib dic did dii dir dit diy drb drc drd dri drr drt dry dtb dtc dtd dti dtr dtt dty dy- dyb dyc dyd dyr dyy i-d ibb ibc ibd ibi ibr ibt iby icb icc icd ici icr ict icy idb idc idd idi idr idt idy iib iic iid iii iir iit ir- irb irc ird iri irr irt iry itb itc itd iti itt ity iyc iyr iyt iyy rbb rbc rbd rbi rbr rbt rcb rcc rcd rci rcr rct rdb rdc rdd rdi rdr rdt rdy rib ric rid rii rir rit riy rrb rrc rrd rri rrr rrt rtb rtc rtd rti rtr rtt rty ry- ryc ryd ryr ryy tbb tbc tbd tbi tbr tbt tcb tcc tcd tci tcr tct tdb tdc tdd tdi tdr tdt tdy tib tic tid tii tir tit tiy trb trc trd tri trr trt try ttb ttc ttd tti ttr ttt tty tyc tyd tyr tyt ybc ybi ybr yby ycc ycd yci ycy ydt ydy yid yii yir yit yrc yrt ytc ytd ytr ytt yyb yyc yyt yyy