-th bbb bbc bbh bbk bbo bbr bbs bbt bcb bcc bch bck bco bcr bcs bct bhb bhc bhh bhk bho bhr bhs bht bkb bkc bkk bko bkr bks bkt bob boc boh bok boo bor bos bot brb brh brk bro brr brs brt bsb bsc bsh bsk bso bsr bss bst btb btc bth btk bto btr bts btt c-- cbb cbc cbh cbk cbo cbr cbs cbt ccb ccc cch cck cco ccr ccs cct ch- chb chc chh chk cho chr chs cht ckb ckc ckh cko cks ckt co- cob coc coh cok coo cor cos cot crb crc crh crk cro crr crs crt csb csc csh csk cso csr css cst ctb ctc cth ctk cto ctr cts ctt hbb hbc hbh hbk hbo hbr hbs hbt hcb hcc hch hck hco hcr hcs hct hhb hhc hhh hhk hho hhr hhs hht hkb hkh hkk hko hkr hks hkt hob hoc hoh hok hoo hor hos hot hr- hrb hrc hrh hrk hro hrr hrs hrt hsb hsc hsh hsk hsr hss hst htb htc hth htk hto htr hts htt k-t kbb kbc kbh kbk kbo kbr kbs kcb kcc kch kck kcr kcs kct khh khk kho khr khs kkb kkc kkh kkk kkr kks kkt kob koc koh kok koo kor kos kot krc krk kro krr krs krt ksb ksc ksh ksk kso ksr kss kst ktb ktc kth ktk kto ktr kts ktt ob- obb obc obh obk obo obr obs obt oc- ocb occ och ock oco ocr ocs oct ohc ohh oho ohr ohs oht okb okc okk oko okr oks oo- oob ooc ooh ook ooo oor oos oot or- orb orc orh ork oro orr ors ort os- osb osc osh osk oso osr oss ost ot- otb otc oth otk oto otr ots ott rbb rbc rbh rbk rbo rbr rbs rbt rcb rcc rch rco rcr rcs rct rh- rhb rhc rhh rho rhr rhs rht rkb rkc rkk rko rks rkt rob roc roh rok roo ror ros rot rrb rrc rrh rrk rrr rrs rrt rsb rsc rsh rsk rso rsr rss rst rtb rtc rtk rto rtr rts rtt sbb sbc sbh sbk sbo sbr sbs sbt scb scc sch sck sco scr scs sct sh- shb shc shh shk sho shr shs sht sk- skb skc skh skk sko skr sks skt sob soc soh sok soo sor sos sot sr- srb src srh srk sro srr srs srt ss- ssb ssc ssh ssk sso ssr sss sst stb stc sth stk sto str sts stt tbb tbc tbh tbk tbo tbr tbs tbt tcb tcc tch tck tco tcr tcs tct th- thb thc thh thk tho thr ths tht tkb tkc tkk tko tkr tks tkt to- tob toc toh tok too tor tos tot trb trc trh trk tro trr trs trt tsb tsc tsh tsk tso tsr tss tst ttb ttc tth ttk tto ttr tts ttt