-th b-u bbb bbh bbk bbo bbr bbs bbt bbu bhb bhh bhk bho bhr bhs bht bhu bkb bkk bko bkr bks bkt bob boh bok boo bor bos bot bou brb brh brk bro brr brs brt bru bsb bsh bsk bso bsr bss bst bsu btb bth btk bto btr bts btt btu bub buh buk buo bur bus but buu hbb hbh hbk hbo hbr hbs hbt hbu hhb hhh hhk hho hhr hhs hht hhu hkb hkh hkk hko hkr hks hkt hku hob hoh hok hoo hor hos hot hou hr- hrb hrh hrk hro hrr hrs hrt hru hsb hsh hsk hsr hss hst hsu htb hth htk hto htr hts htt hub huh huk huo hur hus hut huu k-t kbb kbh kbk kbo kbr kbs kbu khh khk kho khr khs khu kkb kkh kkk kkr kks kkt kku kob koh kok koo kor kos kot kou krk kro krr krs krt kru ksb ksh ksk kso ksr kss kst ksu ktb kth ktk kto ktr kts ktt ktu kub kuh kuk kur kus kut kuu ob- obb obh obk obo obr obs obt obu ohh oho ohr ohs oht ohu okb okk oko okr oks oku oo- oob ooh ook ooo oor oos oot or- orb orh ork oro orr ors ort oru os- osb osh osk oso osr oss ost osu ot- otb oth otk oto otr ots ott otu ou- ouh ouk ouo our ous out rbb rbh rbk rbo rbr rbs rbt rbu rh- rhb rhh rho rhr rhs rht rhu rkb rkk rko rks rkt rku rob roh rok roo ror ros rot rou rrb rrh rrk rrr rrs rrt rru rsb rsh rsk rso rsr rss rst rsu rtb rtk rto rtr rts rtt rtu rub ruh ruk ruo rur rus rut ruu sbb sbh sbk sbo sbr sbs sbt sbu sh- shb shh shk sho shr shs sht shu sk- skb skh skk sko skr sks skt sku sob soh sok soo sor sos sot sou sr- srb srh srk sro srr srs srt ss- ssb ssh ssk sso ssr sss sst ssu stb sth stk sto str sts stt stu sub suh suk suo sur sus sut suu tbb tbh tbk tbo tbr tbs tbt tbu th- thb thh thk tho thr ths tht thu tkb tkk tko tkr tks tkt to- tob toh tok too tor tos tot tou trb trh trk tro trr trs trt tru tsb tsh tsk tso tsr tss tst tsu ttb tth ttk tto ttr tts ttt ttu tub tuh tuk tuo tur tus tut tuu ubb ubh ubk ubo ubr ubs ubt ubu uhb uhh uho uhr uhs uht uhu ukb ukk ukr uku uob uok uoo uor uos uot ur- urb urk uro urr urs urt uru usb ush usk uso usr uss ust usu utb uth utk uto utr uts utt utu uur uus uut uuu