-er b-u bbb bbc bbe bbk bbo bbr bbt bbu bcb bcc bce bck bco bcr bct bcu be- beb bec bee bek beo ber bet beu bkb bkc bke bkk bko bkr bkt bob boc boe bok boo bor bot bou brb bre brk bro brr brt bru btb btc bte btk bto btr btt btu bub buc bue buk buo bur but buu c-- cbb cbc cbe cbk cbo cbr cbt cbu ccb ccc cce cck cco ccr cct ccu ce- ceb cec cee cek ceo cer cet ceu ckb ckc cko ckt co- cob coc coe cok coo cor cot cou crb crc cre crk cro crr crt cru ctb ctc cte ctk cto ctr ctt ctu cub cuc cue cuk cuo cur cut cuu ebb ebc ebe ebk ebo ebr ebt ebu ec- ecb ecc ece eck eco ecr ect ecu eeb eec eee eek eeo eer eet ekb ekc eke eko ekr ekt eku eo- eob eoc eoe eok eoo eor eot eou erb erc ere erk ero err ert eru etb etc ete etk eto etr ett etu eu- eub euc eue eur eut k-t kbb kbc kbe kbk kbo kbr kbu kcb kcc kce kck kcr kct kcu ke- keb kec kee kek keo ker ket kkb kkc kke kkk kkr kkt kku kob koc koe kok koo kor kot kou krc krk kro krr krt kru ktb ktc kte ktk kto ktr ktt ktu kub kuc kue kuk kur kut kuu ob- obb obc obe obk obo obr obt obu oc- ocb occ ock oco ocr oct ocu oeb oec oee oeo oer oet okb okc oke okk oko okr oku oo- oob ooc ook ooo oor oot or- orb orc ore ork oro orr ort oru ot- otb otc ote otk oto otr ott otu ou- ouc oue ouk ouo our out rbb rbc rbe rbk rbo rbr rbt rbu rcb rcc rce rco rcr rct rcu re- reb rec ree rek reo rer ret reu rkb rkc rke rkk rko rkt rku rob roc roe rok roo ror rot rou rrb rrc rrk rrr rrt rru rtb rtc rte rtk rto rtr rtt rtu rub ruc rue ruk ruo rur rut ruu tbb tbc tbe tbk tbo tbr tbt tbu tcb tcc tce tck tco tcr tct tcu te- teb tec tee tek teo ter tet teu tkb tkc tke tkk tko tkr tkt to- tob toc toe tok too tor tot tou trb trc tre trk tro trr trt tru ttb ttc tte ttk tto ttr ttt ttu tub tuc tue tuk tuo tur tut tuu ubb ubc ube ubk ubo ubr ubt ubu ucb ucc uce uck uco ucr uct ucu ueb uec uee uer uet ukb ukc uke ukk ukr uku uob uoc uoe uok uoo uor uot ur- urb urc ure urk uro urr urt uru utb utc ute utk uto utr utt utu uuc uue uur uut uuu

bbbb bbeb bbet bbrc bcbc bccc bcec bcer bcet bcor bcru bctc bcuc bebb bebe bebo beck becu beeb beek beer beet beke beko beo- beok beor beot berc bere berk bero berr bert beru betc bete beto bett betu beuk beur bobb bobe bobo bobu boce bock boco bocu boec boee boeo boer boet boke boko boku boob booc booe book boor boot bor- bore bork boro borr bort boru botb bote boto bott boue bouk bour bout brcb brce breb brec bree brek breo brer bret brkb brob broc broe brok broo bror brot brou brrr brtc bruc brue brut btcc btec btek btob btor btrc btrt bttb bubb bube bubo bubu bucc buce buck buco bucu buer bueu buke bukk buko buku bur- burb bure burk buro burr burt buru but- bute buto butt c-bo cbbc cbcc cbce cbcr cbct cbcu cbec cbee cber cbet cbko cbkr cbot cbre cbrt cbtc ccbc cccb cccc cccu ccee ccob ccoc ccrc ccre ccrt cctb cctc cctt ccuc ccut cebu cec- cece ceco cect ceeb ceec ceke ceor ceou cer- cerc cere cero cert cet- cete ceto ckbc ckbe ckck ckco cker ckob ckoc ckoo ckor ckot ckrc cktb cobb cobe cobo cobu coce cock coco coct cocu cok- coke coko coob cook coot cor- corb corc core cork coro corr cort cotb cotc cote coto cott cotu coub coue couk cour cout crbc crbu crcc crce crcr cre- creb crec cree creo cret creu crkc crob croc croe crok croo cror crot crrt crtc crub crue cruk crut ctec ctor ctot ctrc cub- cubb cube cucc cuce cuck cuek cuer cuk- cuke curb cure curo curr curt cut- cutc cute cuto cutt ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ebru ebur ecbc ecbe eccb eccc ecce ecco ecct ecko eco- ecot ecou ecrc ecrr ecru ect- ectc ecto eeee eeke eeoc eerc eero eetc eete eetu ekco ekeb ekek eker eket ekur eore eotc eoto erbb erbe ercc erce ereb erec erer eret erke erob eroc eroe eroo errc erre erro ertu erub eruc erur etbc etbr etcc etco etec etee eter etoe etok etre etro ette etto ettu eubc euer eur- eurc eure euro eurt kbbb kbbc kbbe kbbk kbbo kbbr kbbt kbbu kbcb kbce kbck kbco kbcr kbct kbcu kbeb kbec kbee kbek kbeo kber kbet kbkb kbkk kbko kbkr kbob kboc kboe kbok kboo kbot kbrb kbrc kbre kbrk kbro kbrt kbru kbtb kbtc kbte kbtk kbto kbtr kbtt kbub kbuc kbue kbuk kbur kbut kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kcct kccu kceb kcec kcee kceo kcet kceu kckc kckk kcko kckr kcob kcoe kcor kcot kcou kcrc kcro kcrr kcrt kcru kctb kctc kcte kcto kctu kcub kcue kcuk kebb kebc kebe kebr kebt kebu keck keco kecr keek keer keet kekb kekc keke keko keku keok ker- kerb kerc kere kerk kero kerr kert keru ket- ketc kete ketk keto ketr kett ketu keur kkbb kkbe kkbo kkbr kkbt kkcb kkck kkco kkcr kkct kkkk