-er bbb bbe bbk bbo bbr bbs bbt be- beb bee bek beo ber bes bet bkb bke bkk bko bkr bks bkt bob boe bok boo bor bos bot brb bre brk bro brr brs brt bsb bse bsk bso bsr bss bst btb bte btk bto btr bts btt ebb ebe ebk ebo ebr ebs ebt eeb eee eek eeo eer ees eet ekb eke eko ekr eks ekt eo- eob eoe eok eoo eor eos eot erb ere erk ero err ers ert es- esb ese esk eso esr ess est etb ete etk eto etr ets ett k-t kbb kbe kbk kbo kbr kbs ke- keb kee kek keo ker kes ket kkb kke kkk kkr kks kkt kob koe kok koo kor kos kot krk kro krr krs krt ksb kse ksk kso ksr kss kst ktb kte ktk kto ktr kts ktt ob- obb obe obk obo obr obs obt oeb oee oeo oer oes oet okb oke okk oko okr oks oo- oob ook ooo oor oos oot or- orb ore ork oro orr ors ort os- osb ose osk oso osr oss ost ot- otb ote otk oto otr ots ott rbb rbe rbk rbo rbr rbs rbt re- reb ree rek reo rer res ret rkb rke rkk rko rks rkt rob roe rok roo ror ros rot rrb rrk rrr rrs rrt rsb rse rsk rso rsr rss rst rtb rte rtk rto rtr rts rtt sbb sbe sbk sbo sbr sbs sbt se- seb see sek seo ser ses set sk- skb ske skk sko skr sks skt sob soe sok soo sor sos sot sr- srb sre srk sro srr srs srt ss- ssb sse ssk sso ssr sss sst stb ste stk sto str sts stt tbb tbe tbk tbo tbr tbs tbt te- teb tee tek teo ter tes tet tkb tke tkk tko tkr tks tkt to- tob toe tok too tor tos tot trb tre trk tro trr trs trt tsb tse tsk tso tsr tss tst ttb tte ttk tto ttr tts ttt

-ose bbbb bbbs bbeb bbet bebb bebe bebo beeb beek beer bees beet beke beko beks beo- beok beor beos beot bere berk bero berr bers bert bes- bese besk beso bess best bete beto bets bett bobb bobe bobo bobs boee boeo boer boes boet boke boko boks boob booe book boor boos boot bor- bore bork boro borr bors bort bose bosk boso boss bost botb bote boto bots bott breb bree brek breo brer bres bret brkb brob broe brok broo bror bros brot brrr brrs brsb brsr brst bseb bsee bser bses bset bskt bsos bsse bsts btek btob btor btrt btss bttb ebbo ebbr ebbs eber ebes eboe eboo ebor ebos ebro eeee eees eeke eeks eero eers eese eesk eete eets ekeb ekek eker ekes eket ekos eoes eore eost eoto eots erbb erbe ereb erer eres eret erke erks erob eroe eroo eros erre erro errs erse erso erst erts esbo esbs esee esek eseo eser eses eset eske esko esks eso- esok esos esse esso esst este esto estr ests etbr etee eter etes etoe etok etos etre etro ette etto k-os kbbb kbbe kbbk kbbo kbbr kbbs kbbt kbeb kbee kbek kbeo kber kbes kbet kbkb kbkk kbko kbkr kbob kboe kbok kboo kbos kbot kbrb kbre kbrk kbro kbrt kbsb kbsk kbso kbsr kbss kbst kbtb kbte kbtk kbto kbtr kbts kbtt kebb kebe kebr kebt keek keer kees keet kekb keke keko keks keok keos ker- kerb kere kerk kero kerr kers kert kesb kesk keso kesr kess kest ket- kete ketk keto ketr kets kett kkbb kkbe kkbo kkbr kkbs kkbt kkkk kkob kkoo kkor kkot kkrb kkre kkrk kkro kkrr kkrs kkrt kkse kksr kkss kkst kktk kkts kobb kobe kobk kobo kobr kobs koes kokb koke kokk koko kokr koks koob kook kooo koor koos koot korb kore kork koro korr kors kort kos- kosb kose koso kosr koss kost kotb kote kotk koto kotr kots kott krbb krbe krbk krbr krbt kreb kree krek kreo kres kret krke krkk krko krkr krks krob kroe krok kroo kror kros krrb krre krrk krro krrr krrs krrt krse krsk krsr krss krst krtk krto krtr krts ksbr ksbs ksee ksek kseo kser kset kskb kske kskk ksko kskr ksks ksob ksok ksoo ksor ksos ksrb ksro ksrr ksrs ksrt ksse ksso kssr ksss ksst kstb kste kstk ksto kstr ksts kstt ktbb ktbr ktbt ktee ktek ktkb ktke ktkk ktko ktkr ktks ktkt ktob ktoe ktok ktoo ktor ktot ktrb ktre ktrk ktro ktrr ktrs ktrt ktso ktsr ktst kttk ktto kttr ktts kttt o-eo obbo ober obes obet obkb oboe obok obor obos obot obre obro obsr obss obst obts oere oers oese oest oker okes oket okko okok okor okot okre okro okso okto oobe ooer ooes oooo ooos oore oort oose oost ootb oots orbb orbe orbo orbs ore- oreb orek oreo orer ores orke orko oro- oroe orok oror oros orot orro orrs orse orsk orso orte orto orts osbe osee osek oser oses oset osoo osor osos osro ossb osse osso oste ostr osts otbs otee oter otes oto- otoe otok otoo otor otos otre otro otrs otse otso otte otto otts rbbb rbbr rbbs rbss rbst rebb rebe rebk rebo rebs reeb reek rees reet reke reko reks rekt reos reot rere rero rers rert rese reso ress rest rete reto retr rets rett rkos rkss rkts rob- robb robe robo robs robt roer roes roet roke rokk roko rokr roks roob rook roor roos root rore rork roro rort rose roso ross rost rote rotk roto rotr rots rott rrrr rsee rsos rsre rsts rtee rtes rtss rtts s-os sbbs sber sbor sbot sbrk sbse sbst sbtk se-e se-k se-o se-s se-t sebe sebo sebs sebt seeb seek seer sees seet seke sekk seko sekt seok serb sere serk sero