-ic bbb bbc bbi bbo bbr bbs bbt bby bcb bcc bci bco bcr bcs bct bcy bi- bib bic bii bio bir bis bit biy bob boc boi boo bor bos bot boy brb bri bro brr brs brt bry bsb bsc bsi bso bsr bss bst bsy btb btc bti bto btr bts btt bty by- byc byi byo byr bys byt c-- cbb cbc cbi cbo cbr cbs cbt cby ccb ccc cci cco ccr ccs cct ci- cib cic cii cio cir cis cit co- cob coc coi coo cor cos cot coy crb crc cri cro crr crs crt cry csb csc csi cso csr css cst csy ctb ctc cti cto ctr cts ctt cty cyb cyc cyo cyr cys cyt ibb ibc ibi ibo ibr ibs ibt iby icb icc ici ico icr ics ict icy iib iic iii iio iir iis iit io- iob ioc ioi ioo ior ios iot ir- irb irc iri iro irr irs irt iry is- isb isc isi iso isr iss ist isy itb itc iti ito its itt ity iyc iyo iyr iys iyt iyy o-i ob- obb obc obi obo obr obs obt oby oc- ocb occ oci oco ocr ocs oct oib oic oii oio oir ois oit oo- oob ooc ooi ooo oor oos oot or- orb orc ori oro orr ors ort ory os- osb osc osi oso osr oss ost ot- otb otc oti oto otr ots ott oyi oyo oys rbb rbc rbi rbo rbr rbs rbt rcb rcc rci rco rcr rcs rct rib ric rii rio rir ris rit riy rob roc roi roo ror ros rot roy rrb rrc rri rrr rrs rrt rsb rsc rsi rso rsr rss rst rtb rtc rti rto rtr rts rtt rty ry- ryc ryo ryr rys ryy sbb sbc sbi sbo sbr sbs sbt sby scb scc sci sco scr scs sct sib sic sii sio sir sis sit sob soc soi soo sor sos sot soy sr- srb src sri sro srr srs srt sry ss- ssb ssc ssi sso ssr sss sst stb stc sti sto str sts stt sty sy- syb syc syi syr sys syt tbb tbc tbi tbo tbr tbs tbt tcb tcc tci tco tcr tcs tct tib tic tii tio tir tis tit tiy to- tob toc toi too tor tos tot toy trb trc tri tro trr trs trt try tsb tsc tsi tso tsr tss tst tsy ttb ttc tti tto ttr tts ttt tty tyc tyo tyr tys tyt ybc ybi ybr ybs yby ycc yci yco ycs ycy yii yio yir yis yit yob yoc yoi yoo yor yos yot yoy yrc yro yrs yrt ysb ysc ysi yso ysr yss yst ysy ytc yto ytr yts ytt yyb yyc yys yyt yyy