bbb bbc bbn bbo bbr bbt bby bcb bcc bcn bco bcr bct bcy bnb bnc bnn bno bnr bnt bob boc bon boo bor bot boy brb brn bro brr brt bry btb btc btn bto btr btt bty by- byc byn byo byr byt c-- cbb cbc cbn cbo cbr cbt cby ccb ccc ccn cco ccr cct cn- cnb cnc cnn cno cnr cnt cny co- cob coc con coo cor cot coy crb crc crn cro crr crt cry ctb ctc ctn cto ctr ctt cty cyb cyc cyn cyo cyr cyt nbb nbc nbn nbo nbr nbt ncb ncc ncn nco ncr nct nnb nnc nnn nno nnt no- nob noc non noo nor not noy nrb nrc nrn nro nrr nrt nry ntb ntc ntn nto ntr ntt nyc nyn nyo nyt nyy ob- obb obc obn obo obr obt oby oc- ocb occ ocn oco ocr oct on- onb onc onn ono onr ont ony oo- oob ooc oon ooo oor oot or- orb orc orn oro orr ort ory ot- otb otc otn oto otr ott oyo rbb rbc rbn rbo rbr rbt rcb rcc rcn rco rcr rct rnb rnc rnn rno rnr rnt rny rob roc ron roo ror rot roy rrb rrc rrn rrr rrt rtb rtc rtn rto rtr rtt rty ry- ryc ryn ryo ryr ryy tbb tbc tbn tbo tbr tbt tcb tcc tcn tco tcr tct tnb tnc tnn tno tnr tnt to- tob toc ton too tor tot toy trb trc trn tro trr trt try ttb ttc ttn tto ttr ttt tty tyc tyn tyo tyr tyt ybc ybr yby ycc yco ycy ynn yny yob yoc yon yoo yor yot yoy yrc yrn yro yrt ytc ytn yto ytr ytt yyb yyc yyt yyy