-er bbb bbe bbk bbn bbr bbs bbt be- beb bee bek ben ber bes bet bkb bke bkk bkn bkr bks bkt bnb bne bnk bnn bnr bns bnt brb bre brk brn brr brs brt bsb bse bsk bsn bsr bss bst btb bte btk btn btr bts btt ebb ebe ebk ebn ebr ebs ebt eeb eee eek een eer ees eet ekb eke ekr eks ekt en- enb ene enk enn enr ens ent erb ere erk ern err ers ert es- esb ese esk esn esr ess est etb ete etk etn etr ets ett k-t kbb kbe kbk kbn kbr kbs ke- keb kee kek ken ker kes ket kkb kke kkk kkn kkr kks kkt kn- kne knk knn knr knt krk krn krr krs krt ksb kse ksk ksn ksr kss kst ktb kte ktk ktn ktr kts ktt nbb nbe nbk nbn nbr nbs nbt ne- neb nee nek nen ner nes net nke nkk nkn nkr nks nkt nnb nne nnk nnn nns nnt nrb nre nrk nrn nrr nrs nrt nsb nse nsk nsn nsr nss nst ntb nte ntk ntn ntr nts ntt rbb rbe rbk rbn rbr rbs rbt re- reb ree rek ren rer res ret rkb rke rkk rks rkt rnb rnn rnr rns rnt rrb rrk rrn rrr rrs rrt rsb rse rsk rsn rsr rss rst rtb rte rtk rtn rtr rts rtt sbb sbe sbk sbn sbr sbs sbt se- seb see sek sen ser ses set sk- skb ske skk skr sks skt snb sne snk snn snr sns snt sr- srb sre srk srn srr srs srt ss- ssb sse ssk ssn ssr sss sst stb ste stk stn str sts stt tbb tbe tbk tbn tbr tbs tbt te- teb tee tek ten ter tes tet tkb tke tkk tkr tks tkt tnb tne tnk tnn tnr tns tnt trb tre trk trn trr trs trt tsb tse tsk tsn tsr tss tst ttb tte ttk ttn ttr tts ttt

-ene bbbb bbbs bbeb bbet bebb bebe beeb beek been beer bees beet beke beks bene benk benn bens bent bere berk bern berr bers bert bes- bese besk bess best bete bets bett bner bnet bnrr bnss breb bree brek bren brer bres bret brkb brns brrr brrs brsb brsr brst bseb bsee bser bses bset bskt bsns bsse bsts btek bten btrt btss bttb ebbr ebbs eben eber ebes eeee eees eeke eeks eens eent eers eese eesk eete eets ekeb ekek eken eker ekes eket ekne enb- enbn enbr enee ener enes enke enkr enne enns enrs ense enst ent- ente entr ents erbb erbe ereb eren erer eres eret erke erks erne erns erre errs erse erst erts esbs esee esek esen eser eses eset eske esks esne esse esst este estr ests etbr etee eten eter etes etne etnr etns etre ette ettn kbbb kbbe kbbk kbbr kbbs kbbt kbeb kbee kbek kben kber kbes kbet kbkb kbkk kbkr kbnn kbnr kbrb kbre kbrk kbrn kbrt kbsb kbsk kbsn kbsr kbss kbst kbtb kbte kbtk kbtn kbtr kbts kbtt kebb kebe kebn kebr kebt keek keen keer kees keet kekb keke keks ken- kene kenk kenn kenr kens kent ker- kerb kere kerk kern kerr kers kert kesb kesk kesn kesr kess kest ket- kete ketk ketr kets kett kkbb kkbe kkbn kkbr kkbs kkbt kken kkkk kknb kkne kknn kkns kknt kkrb kkre kkrk kkrn kkrr kkrs kkrt kkse kksn kksr kkss kkst kktk kkts knbb knbe knbn knbr knbt kneb knee knek knen knes knet knkk knkt knnb knnk knnr knns knrb knrk knrs knsb knse knsk knsn knsr knss knst knte kntk kntn kntr knts krbb krbe krbk krbr krbt kreb kree krek kren kres kret krke krkk krkn krkr krks krnb krne krnk krnn krnt krrb krre krrk krrn krrr krrs krrt krse krsk krsn krsr krss krst krtk krtn krtr krts ksbn ksbr ksbs ksee ksek ksen kser kset kskb kske kskk kskn kskr ksks ksnb ksnk ksnn ksnr ksns ksnt ksrb ksrn ksrr ksrs ksrt ksse kssn kssr ksss ksst kstb kste kstk kstn kstr ksts kstt ktbb ktbn ktbr ktbt ktee ktek kten ktkb ktke ktkk ktkn ktkr ktks ktkt ktne ktnk ktnn ktns ktnt ktrb ktre ktrk ktrn ktrr ktrs ktrt ktsn ktsr ktst kttk kttn kttr ktts kttt nber nebb nebe nebn nebr nebs neeb neen neer nees neet neke nene nens nent nere nerk nerr ners nert nesb nese nesn nesr ness nest net- netb nete nets nett nknt nktr nnes nnnn nnss nntn nren nrts nseb nser nskk nsnr nssb nsse nssr nsss nsts nter ntes ntsb ntss nttr rbbb rbbr rbbs rbss rbst rebb rebe rebk rebs reeb reek reen rees reet reke reks rekt rene renk renn rens rent rere rers rert rese resn ress rest rete retr rets rett rkss rkts rnbr rnnt rrrr rsee rsnn rsnr rsre rsts rtee rtes rtkn rtns rtss rtts sbbs sber sbrk sbse sbst sbtk sbtn se-e se-k se-n se-s se-t sebe sebs sebt seeb seek seen seer sees seet seke sekk sekt sene senn senr sens sent serb sere serk sern serr sers sert sese sess sest set- sete sets sett skee sken sker skes sket skn- skrt skss sneb snee sner snes snet snns snrk snrs snte sntr sreb sres srnn srtr ssbn ssbr ssee sses sset ssns ssrs sssb ssss sstb ssts stbs stee stek sten ster stes stet stks stnn stnr stns stre strk strn strs stss sttr tbbs tbrb tbst teek teen teer tees teet teke tenb tene tenk tenn tens tent ter- tere terk tern terr ters tese tess test tete tetr tets tett tkts tneb tnes tnks tnts tre- tree trek tren tres tret trst trte trtr tsen tses tset tsks tsse tssr tsst tsts ttbb tten tter ttss tttt

-tree b-r-k bbbee bbser be-er bebek beber bebes beebe beebs beeke beene beens beers beest beete beets