-th b-u bbb bbc bbh bbk bbo bbr bbs bbt bbu bcb bcc bch bck bco bcr bcs bct bcu bhb bhc bhh bhk bho bhr bhs bht bhu bkb bkc bkk bko bkr bks bkt bob boc boh bok boo bor bos bot bou brb brh brk bro brr brs brt bru bsb bsc bsh bsk bso bsr bss bst bsu btb btc bth btk bto btr bts btt btu bub buc buh buk buo bur bus but buu c-- cbb cbc cbh cbk cbo cbr cbs cbt cbu ccb ccc cch cck cco ccr ccs cct ccu ch- chb chc chh chk cho chr chs cht chu ckb ckc ckh cko cks ckt co- cob coc coh cok coo cor cos cot cou crb crc crh crk cro crr crs crt cru csb csc csh csk cso csr css cst csu ctb ctc cth ctk cto ctr cts ctt ctu cub cuc cuh cuk cuo cur cus cut cuu hbb hbc hbh hbk hbo hbr hbs hbt hbu hcb hcc hch hck hco hcr hcs hct hhb hhc hhh hhk hho hhr hhs hht hhu hkb hkh hkk hko hkr hks hkt hku hob hoc hoh hok hoo hor hos hot hou hr- hrb hrc hrh hrk hro hrr hrs hrt hru hsb hsc hsh hsk hsr hss hst hsu htb htc hth htk hto htr hts htt hub huc huh huk huo hur hus hut huu k-t kbb kbc kbh kbk kbo kbr kbs kbu kcb kcc kch kck kcr kcs kct kcu khh khk kho khr khs khu kkb kkc kkh kkk kkr kks kkt kku kob koc koh kok koo kor kos kot kou krc krk kro krr krs krt kru ksb ksc ksh ksk kso ksr kss kst ksu ktb ktc kth ktk kto ktr kts ktt ktu kub kuc kuh kuk kur kus kut kuu ob- obb obc obh obk obo obr obs obt obu oc- ocb occ och ock oco ocr ocs oct ocu ohc ohh oho ohr ohs oht ohu okb okc okk oko okr oks oku oo- oob ooc ooh ook ooo oor oos oot or- orb orc orh ork oro orr ors ort oru os- osb osc osh osk oso osr oss ost osu ot- otb otc oth otk oto otr ots ott otu ou- ouc ouh ouk ouo our ous out rbb rbc rbh rbk rbo rbr rbs rbt rbu rcb rcc rch rco rcr rcs rct rcu rh- rhb rhc rhh rho rhr rhs rht rhu rkb rkc rkk rko rks rkt rku rob roc roh rok roo ror ros rot rou rrb rrc rrh rrk rrr rrs rrt rru rsb rsc rsh rsk rso rsr rss rst rsu rtb rtc rtk rto rtr rts rtt rtu rub ruc ruh ruk ruo rur rus rut ruu sbb sbc sbh sbk sbo sbr sbs sbt sbu scb scc sch sck sco scr scs sct scu sh- shb shc shh shk sho shr shs sht shu sk- skb skc skh skk sko skr sks skt sku sob soc soh sok soo sor sos sot sou sr- srb src srh srk sro srr srs srt ss- ssb ssc ssh ssk sso ssr sss sst ssu stb stc sth stk sto str sts stt stu sub suc suh suk suo sur sus sut suu tbb tbc tbh tbk tbo tbr tbs tbt tbu tcb tcc tch tck tco tcr tcs tct tcu th- thb thc thh thk tho thr ths tht thu tkb tkc tkk tko tkr tks tkt to- tob toc toh tok too tor tos tot tou trb trc trh trk tro trr trs trt tru tsb tsc tsh tsk tso tsr tss tst tsu ttb ttc tth ttk tto ttr tts ttt ttu tub tuc tuh tuk tuo tur tus tut tuu ubb ubc ubh ubk ubo ubr ubs ubt ubu ucb ucc uch uck uco ucr ucs uct ucu uhb uhc uhh uho uhr uhs uht uhu ukb ukc ukk ukr uku uob uoc uok uoo uor uos uot ur- urb urc urk uro urr urs urt uru usb usc ush usk uso usr uss ust usu utb utc uth utk uto utr uts utt utu uuc uur uus uut uuu