-th bbb bbc bbh bbo bbr bbs bbt bcb bcc bch bco bcr bcs bct bhb bhc bhh bho bhr bhs bht bob boc boh boo bor bos bot brb brh bro brr brs brt bsb bsc bsh bso bsr bss bst btb btc bth bto btr bts btt c-- cbb cbc cbh cbo cbr cbs cbt ccb ccc cch cco ccr ccs cct ch- chb chc chh cho chr chs cht co- cob coc coh coo cor cos cot crb crc crh cro crr crs crt csb csc csh cso csr css cst ctb ctc cth cto ctr cts ctt hbb hbc hbh hbo hbr hbs hbt hcb hcc hch hco hcr hcs hct hhb hhc hhh hho hhr hhs hht hob hoc hoh hoo hor hos hot hr- hrb hrc hrh hro hrr hrs hrt hsb hsc hsh hsr hss hst htb htc hth hto htr hts htt ob- obb obc obh obo obr obs obt oc- ocb occ och oco ocr ocs oct ohc ohh oho ohr ohs oht oo- oob ooc ooh ooo oor oos oot or- orb orc orh oro orr ors ort os- osb osc osh oso osr oss ost ot- otb otc oth oto otr ots ott rbb rbc rbh rbo rbr rbs rbt rcb rcc rch rco rcr rcs rct rh- rhb rhc rhh rho rhr rhs rht rob roc roh roo ror ros rot rrb rrc rrh rrr rrs rrt rsb rsc rsh rso rsr rss rst rtb rtc rto rtr rts rtt sbb sbc sbh sbo sbr sbs sbt scb scc sch sco scr scs sct sh- shb shc shh sho shr shs sht sob soc soh soo sor sos sot sr- srb src srh sro srr srs srt ss- ssb ssc ssh sso ssr sss sst stb stc sth sto str sts stt tbb tbc tbh tbo tbr tbs tbt tcb tcc tch tco tcr tcs tct th- thb thc thh tho thr ths tht to- tob toc toh too tor tos tot trb trc trh tro trr trs trt tsb tsc tsh tso tsr tss tst ttb ttc tth tto ttr tts ttt