-er b-p bbb bbe bbi bbk bbp bbr bbt be- beb bee bei bek bep ber bet bi- bib bie bii bik bip bir bit bkb bke bkk bkp bkr bkt bpb bpe bpi bpp bpr bpt brb bre bri brk brp brr brt btb bte bti btk btp btr btt ebb ebe ebi ebk ebp ebr ebt eeb eee eek eep eer eet eib eie eii eik eip eir eit ekb eke eki ekp ekr ekt ep- epb epe epi epp epr ept erb ere eri erk erp err ert etb ete eti etk etp etr ett ibb ibe ibi ibk ibp ibr ibt ie- iee iei iek iep ier iet iib iie iii iip iir iit ikb ike iki ikk ikr ikt ipb ipe ipi ipp ipr ipt ir- irb ire iri irk irp irr irt itb ite iti itk itp itt k-t kbb kbe kbi kbk kbp kbr ke- keb kee kei kek kep ker ket kib kie kii kik kip kir kit kkb kke kki kkk kkp kkr kkt kpe kpi kpk kpp kpr kpt kri krk krp krr krt ktb kte ktk ktp ktr ktt p-p pbb pbe pbi pbk pbp pbr pbt peb pee pei pek pep per pet pib pie pii pik pip pir pit pkb pke pki pkp pkr pkt ppb ppe ppi ppk ppp ppr ppt prb pre pri prk prp prr prt pt- ptb pte pti ptk ptp ptr ptt rbb rbe rbi rbk rbp rbr rbt re- reb ree rei rek rep rer ret rib rie rii rik rip rir rit rkb rke rkk rkp rkt rpb rpe rpi rpk rpp rpr rpt rrb rri rrk rrp rrr rrt rtb rte rti rtk rtp rtr rtt tbb tbe tbi tbk tbp tbr tbt te- teb tee tei tek tep ter tet tib tie tii tik tip tir tit tkb tke tkk tkp tkr tkt tpb tpe tpi tpk tpp tpr tpt trb tre tri trk trp trr trt ttb tte tti ttk ttp ttr ttt

bbbb bbeb bbet bbpr bebb bebe bebi beeb beek beep beer beet beik beir beit beke beki bere beri berk berr bert bete beti bett bibb bibe bibi bieb bier biet bike bipp birb bire biri birk birr birt bite bitt bkpr bkpt bpti breb bree brei brek brep brer bret brie brik brit brkb brrr btbp btek btie btrt bttb ebbr eber ebit eeee eeke eete eiei eier eike eiki eipr eire eitb eiti eitr ekeb ekek eker eket ekki ekpe epee eper epi- epie epik epip epit eppp eprb eprp epte erbb erbe ereb erei erer eret erie erik erit erke erki erpe erre etbr etee eter etik etre ette etti i-be ibet ibie ibri ibtb ieet ieie iere ieri iett iiie iiii iiit iitr iitt ikee iker ikki ikri ipbk ipek iper ipet ipie ippr ipri irbe irbp iree irer iri- irie irip irki irpe irre irri irte irti irtp itbe itek itep iter itet itie itri kbbb kbbe kbbi kbbk kbbr kbbt kbeb kbee kbek kber kbet kbib kbie kbik kbit kbkb kbkk kbkr kbpe kbpi kbpk kbpr kbpt kbrb kbre kbri kbrk kbrt kbtb kbte kbtk kbtr kbtt kebb kebe kebi kebr kebt keek keep keer keet keib keii keik keir kekb keke keki kep- kepe kepi kept ker- kerb kere keri kerk kerp kerr kert ket- kete keti ketk ketp ketr kett kibb kibe kibi kibr kibt kier kiii kiik kiip kiit kiki kikk kikr kikt kip- kipe kipi kipp kipr kipt kirb kiri kirk kirp kirr kirt kite kiti kitr kitt kkbb kkbe kkbi kkbr kkbt kkik kkit kkkk kkpk kkpt kkrb kkre kkrk kkrr kkrt kktk kpbb kpbe kpbi kpbr kpek kper kpet kpir kpit kpke kpkk kpkr kppk kppp kppr kprb kpre kpri kprk kprp kprr kprt kpte kptr kptt krbb krbe krbi krbk krbr krbt kreb kree krei krek kret krib krik krit krke krki krkk krkr krpi krpr krpt krrb krre krri krrk krrr krrt krti krtk krtr ktbb ktbr ktbt ktee ktek ktep ktib ktie ktik ktip ktkb ktke ktkk ktkr ktkt ktpi ktpk ktpr ktpt ktrb ktre ktri ktrk ktrp ktrr ktrt ktti kttk kttp kttr kttt pbpk peek peep peer peet peip peir peit peke peki pekk pepe pepi per- pere peri perk perp perr pert pete peti petr pett pibb pibi piep pier piet piip pike piki pikk pikt pipe pipi pipp pire piri pirk pirr pite piti pitr pitt pkib pper ppib ppie pppp pptt pre- preb pree prek prep pret pri- prie prii prri prti prtp prtr pter pttk rbbb rbbr rebb rebe rebk reeb reek reep reet reii reik reir reit reke reki rekt repe repi repp repr rept rere reri rert rete reti retr rett rib- ribe riek riep rier riet rike riki rikk ripe ripi ripp ripr ript rire riri rite riti ritt rpet rpii rrrr rtee rtei rttp tbit tbrb tbtp teek teer teet teie teip teir teke tepe tepi tepp ter- tere teri terk terp terr tete teti tetr tett tibi tie- tiee tiei tiep tier tiet tiit tike tiki tip- tipe tipi tipp tipt tirb tire tiri tirr tite titi titp titt tkip tper tpir tpke tppp tppr tpte tptp tptr tre- tree trei trek tret tri- trib trie trik trip trit trpe trpp trte trtr ttbb tter tttt

-tree b-r-k bbbee be-er bebek beber bebti beebe beeke beepi beeri beete beibi beier beire beite beker bekir bekke bekti beppe berbe berei berek beret berie berit berk- berke berre berri berte berti betee beter betie betke betre bett- bette betti bibbe biber bibie bibri biebe bieke biere bieri biert bieti biker bikie bipib birie bitek biter bitit bitki bitte bitti bkite breek breer breet breik breit breke brere brett bribe brier brike brite britt brrrr btr-t ebber ebbet ebbie ebert ebibe ebike eeeee eepee eerie eerik eetti eiker eipri eirie eiter eitri ekbir ekker eppie epptb erbbe erber erept erere erier erite erkki erte erter eteke etete etike etite etree etrek