-ic bbb bbc bbd bbi bbr bbs bbt bby bcb bcc bcd bci bcr bcs bct bcy bdb bdc bdd bdi bdr bds bdt bdy bi- bib bic bid bii bir bis bit biy brb brd bri brr brs brt bry bsb bsc bsd bsi bsr bss bst bsy btb btc btd bti btr bts btt bty by- byc byd byi byr bys byt c-- cbb cbc cbd cbi cbr cbs cbt cby ccb ccc ccd cci ccr ccs cct cdb cdc cdd cdi cdr cds cdt cdy ci- cib cic cid cii cir cis cit crb crc crd cri crr crs crt cry csb csc csd csi csr css cst csy ctb ctc ctd cti ctr cts ctt cty cyb cyc cyd cyr cys cyt dbb dbc dbd dbi dbr dbs dbt dby dcb dcc dcd dci dcr dcs dct ddb ddc ddd ddi ddr dds ddt ddy di- dib dic did dii dir dis dit diy drb drc drd dri drr drs drt dry dsb dsc dsd dsi dsr dss dst dsy dtb dtc dtd dti dtr dts dtt dty dy- dyb dyc dyd dyr dys dyy i-d ibb ibc ibd ibi ibr ibs ibt iby icb icc icd ici icr ics ict icy idb idc idd idi idr ids idt idy iib iic iid iii iir iis iit ir- irb irc ird iri irr irs irt iry is- isb isc isd isi isr iss ist isy itb itc itd iti its itt ity iyc iyr iys iyt iyy rbb rbc rbd rbi rbr rbs rbt rcb rcc rcd rci rcr rcs rct rdb rdc rdd rdi rdr rds rdt rdy rib ric rid rii rir ris rit riy rrb rrc rrd rri rrr rrs rrt rsb rsc rsd rsi rsr rss rst rtb rtc rtd rti rtr rts rtt rty ry- ryc ryd ryr rys ryy sbb sbc sbd sbi sbr sbs sbt sby scb scc scd sci scr scs sct sdb sdc sdd sdi sdr sds sdt sdy sib sic sid sii sir sis sit sr- srb src srd sri srr srs srt sry ss- ssb ssc ssd ssi ssr sss sst stb stc std sti str sts stt sty sy- syb syc syd syi syr sys syt tbb tbc tbd tbi tbr tbs tbt tcb tcc tcd tci tcr tcs tct tdb tdc tdd tdi tdr tds tdt tdy tib tic tid tii tir tis tit tiy trb trc trd tri trr trs trt try tsb tsc tsd tsi tsr tss tst tsy ttb ttc ttd tti ttr tts ttt tty tyc tyd tyr tys tyt ybc ybi ybr ybs yby ycc ycd yci ycs ycy yds ydt ydy yid yii yir yis yit yrc yrs yrt ysb ysc ysi ysr yss yst ysy ytc ytd ytr yts ytt yyb yyc yys yyt yyy