-er -up b-p b-u bbb bbc bbe bbk bbp bbr bbt bbu bcb bcc bce bck bcp bcr bct bcu be- beb bec bee bek bep ber bet beu bkb bkc bke bkk bkp bkr bkt bpb bpc bpe bpp bpr bpt bpu brb bre brk brp brr brt bru btb btc bte btk btp btr btt btu bub buc bue buk bup bur but buu c-- cbb cbc cbe cbk cbp cbr cbt cbu ccb ccc cce cck ccp ccr cct ccu ce- ceb cec cee cek cep cer cet ceu ckb ckc ckt cpb cpc cpe cpk cpp cpr cpt cpu crb crc cre crk crp crr crt cru ctb ctc cte ctk ctp ctr ctt ctu cub cuc cue cuk cup cur cut cuu ebb ebc ebe ebk ebp ebr ebt ebu ec- ecb ecc ece eck ecr ect ecu eeb eec eee eek eep eer eet ekb ekc eke ekp ekr ekt eku ep- epb epc epe epp epr ept epu erb erc ere erk erp err ert eru etb etc ete etk etp etr ett etu eu- eub euc eue eup eur eut k-t kbb kbc kbe kbk kbp kbr kbu kcb kcc kce kck kcp kcr kct kcu ke- keb kec kee kek kep ker ket kkb kkc kke kkk kkp kkr kkt kku kpc kpe kpk kpp kpr kpt kpu krc krk krp krr krt kru ktb ktc kte ktk ktp ktr ktt ktu kub kuc kue kuk kup kur kut kuu p-p pbb pbc pbe pbk pbp pbr pbt pbu pcb pcc pce pck pcp pcr pct pcu peb pec pee pek pep per pet peu pkb pkc pke pkp pkr pkt pku ppb ppc ppe ppk ppp ppr ppt ppu prb prc pre prk prp prr prt pru pt- ptb ptc pte ptk ptp ptr ptt ptu pub puc pue puk pup pur put puu rbb rbc rbe rbk rbp rbr rbt rbu rcb rcc rce rcp rcr rct rcu re- reb rec ree rek rep rer ret reu rkb rkc rke rkk rkp rkt rku rpb rpc rpe rpk rpp rpr rpt rpu rrb rrc rrk rrp rrr rrt rru rtb rtc rte rtk rtp rtr rtt rtu rub ruc rue ruk rup rur rut ruu tbb tbc tbe tbk tbp tbr tbt tbu tcb tcc tce tck tcp tcr tct tcu te- teb tec tee tek tep ter tet teu tkb tkc tke tkk tkp tkr tkt tpb tpc tpe tpk tpp tpr tpt tpu trb trc tre trk trp trr trt tru ttb ttc tte ttk ttp ttr ttt ttu tub tuc tue tuk tup tur tut tuu ubb ubc ube ubk ubp ubr ubt ubu ucb ucc uce uck ucp ucr uct ucu ueb uec uee uep uer uet ukb ukc uke ukk ukp ukr uku up- upb upc upe upk upp upr upt upu ur- urb urc ure urk urp urr urt uru utb utc ute utk utp utr utt utu uuc uue uur uut uuu

bbbb bbeb bbet bbpr bbrc bcbc bcbp bccc bcec bcer bcet bcpp bcru bctc bcuc bcup bebb bebe beck becu beeb beek beep beer beet beke berc bere berk berr bert beru betc bete bett betu beuk beur bkpr bkpt bpcp bprc brcb brce breb brec bree brek brep brer bret brkb brrr brtc bruc brue brup brut btbp btcc btec btek btrc btrt bttb bubb bube bubu bucc buce buck bucu buer bueu buke bukk buku bupc bur- burb bure burk burp burr burt buru but- bute butt cbbc cbcc cbce cbcp cbcr cbct cbcu cbec cbee cber cbet cbkr cbpc cbpp cbre cbrt cbtc ccbc cccb cccc cccp cccu ccee ccpe ccpp ccpr ccrc ccre ccrp ccrt cctb cctc cctt ccuc ccup ccut cebp cebu cec- cece cecp cect ceeb ceec ceke cepc cepe cepp cepr cept cer- cerc cere cerp cert cet- cete cetp ckbc ckbe ckck cker ckpc ckpr ckrc cktb cpbc cpce cpcu cpeb cpep cper cpre cprt cptp cptr crbc crbu crcc crce crcr cre- creb crec cree crep cret creu crkc crkp crpc crrt crtc crtp crub crue cruk crup crut ctcp ctec ctep ctpp ctrc ctrp cub- cubb cube cucc cuce cuck cuek cuer cuk- cuke cupe cupp cupr curb cure curr curt cut- cutc cute cutt ebbc ebbr ebcc eber ebru ebur ecbc ecbe eccb eccc ecce ecct ecpp ecrc ecrr ecru ect- ectc eeee eeke eerc eetc eete eetu ekeb ekek eker eket ekpe ekur epcc epec epee eper eppc eppp eprb eprp epte epub erbb erbe ercc erce ercp ereb erec erer eret erke erpe errc erre ertu erub eruc erur etbc etbr etcc etec etee eter etre ette ettu eubc euer eur- eurc eure eurt kbbb kbbc kbbe kbbk kbbr kbbt kbbu kbcb kbce kbck kbcr kbct kbcu kbeb kbec kbee kbek kber kbet kbkb kbkk kbkr kbpc kbpe kbpk kbpr kbpt kbpu kbrb kbrc kbre kbrk kbrt kbru kbtb kbtc kbte kbtk kbtr kbtt kbub kbuc kbue kbuk kbup kbur kbut kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kcct kccu kceb kcec kcee kcep kcet kceu kckc kckk kckr kcpc kcpr kcpt kcpu kcrc kcrp kcrr kcrt kcru kctb kctc kcte kctu kcub kcue kcuk kcup kebb kebc kebe kebr kebt kebu keck kecr keek keep keer keet kekb kekc keke keku kep- kepc kepe kept kepu ker- kerb kerc kere kerk kerp kerr kert keru ket- ketc kete ketk ketp ketr kett ketu keup keur kkbb kkbe kkbr kkbt kkcb kkck kkcr kkct kkkk kkpc kkpk kkpt kkrb kkrc kkre kkrk kkrr kkrt kktc kktk kktu kkup kkut kkuu kpbb kpbe kpbr kpcc kpcr kpek kper kpet kpke kpkk kpkr kppc kppk kppp kppr kprb kprc kpre kprk kprp kprr kprt kpru kpte kptr kptt kpub kpur krbb krbe krbk krbr krbt krcb krcc krce krcu kreb krec kree krek kret kreu krkc krke krkk krkr krku krpr krpt krpu krrb krrc krre krrk krrr krrt krtc krtk krtr kruc krue kruk krup krur