-er b-u bbb bbc bbe bbg bbk bbo bbr bbu bcb bcc bce bcg bck bco bcr bcu be- beb bec bee beg bek beo ber beu bgb bgc bge bgg bgk bgo bgr bgu bkb bkc bke bkg bkk bko bkr bob boc boe bog bok boo bor bou brb bre brg brk bro brr bru bub buc bue bug buk buo bur buu c-- cbb cbc cbe cbg cbk cbo cbr cbu ccb ccc cce ccg cck cco ccr ccu ce- ceb cec cee ceg cek ceo cer ceu cgb cgc cge cgg cgo cgr cgu ckb ckc cko co- cob coc coe cog cok coo cor cou crb crc cre crg crk cro crr cru cub cuc cue cug cuk cuo cur cuu ebb ebc ebe ebg ebk ebo ebr ebu ec- ecb ecc ece ecg eck eco ecr ecu eeb eec eee eeg eek eeo eer egb egc ege egg ego egr egu ekb ekc eke ekg eko ekr eku eo- eob eoc eoe eog eok eoo eor eou erb erc ere erg erk ero err eru eu- eub euc eue eug eur gbc gbe gbg gbk gbo gbr gbu gcb gcc gce gcg gck gco gcr gcu ge- geb gec gee geg gek geo ger geu ggb ggc ggg ggo ggr ggu gkb gko gob goc goe gog gok goo gor gou grb grc gre grg grk gro grr gru gu- gub guc gue gug guk guo gur guu kbb kbc kbe kbk kbo kbr kbu kcb kcc kce kcg kck kcr kcu ke- keb kec kee keg kek keo ker kgb kgc kgo kgu kkb kkc kke kkk kkr kku kob koc koe kog kok koo kor kou krc krg krk kro krr kru kub kuc kue kug kuk kur kuu ob- obb obc obe obg obk obo obr obu oc- ocb occ ocg ock oco ocr ocu oeb oec oee oeg oeo oer ogc oge ogg ogo okb okc oke okg okk oko okr oku oo- oob ooc oog ook ooo oor or- orb orc ore org ork oro orr oru ou- ouc oue ouk ouo our rbb rbc rbe rbg rbk rbo rbr rbu rcb rcc rce rcg rco rcr rcu re- reb rec ree reg rek reo rer reu rgb rgc rge rgg rgk rgo rgr rkb rkc rke rkg rkk rko rku rob roc roe rog rok roo ror rou rrb rrc rrg rrk rrr rru rub ruc rue rug ruk ruo rur ruu ubb ubc ube ubg ubk ubo ubr ubu ucb ucc uce ucg uck uco ucr ucu ueb uec uee ueg uer ugb ugc uge ugg ugk ugo ugr ugu ukb ukc uke ukk ukr uku uob uoc uoe uog uok uoo uor ur- urb urc ure urg urk uro urr uru uuc uue uug uur uuu

bbbb bbeb bbrc bbrg bcbc bcbg bccc bcec bcer bcor bcru bcuc bebb bebe bebo beck becu beeb beeg beek beer begg bego begu beke beko beo- beok beor berc bere berg berk bero berr beru beuk beur bobb bobe bobo bobu boce bock boco bocu boec boee boeo boer boge bogg bogo boke boko boku boob booc booe boog book boor bor- bore borg bork boro borr boru boue bouk bour brcb brce breb brec bree breg brek breo brer brkb brob broc broe brog brok broo bror brou brrr bruc brue brug bubb bube bubo bubu bucc buce buck buco bucu buer bueu buge bugg bugo buke bukk buko buku bur- burb bure burg burk buro burr buru c-bo cbbc cbcc cbce cbcr cbcu cbec cbee cber cbgb cbkg cbko cbkr cbre ccbc cccb cccc cccu ccee ccgc ccob ccoc ccrc ccre ccrg ccuc cebu cec- cece ceco ceeb ceec cege cego ceke ceor ceou cer- cerc cere cero cgcc cgcg cger cgro ckbc ckbe ckck ckco cker ckgo ckob ckoc ckoo ckor ckrc cobb cobe cobo cobu coce cock coco cocu cogo cok- coke coko coob cook cor- corb corc core corg cork coro corr coub coue couk cour crbc crbu crcc crce crcr cre- creb crec cree creg creo creu crkc crob croc croe crok croo cror crub crue crug cruk cub- cubb cube cucc cuce cuck cuek cuer cuk- cuke curb cure curo curr ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ebru ebur ecbc ecbe eccb eccc ecce ecco ecko eco- ecog ecou ecrc ecrr ecru eeee eeke eeoc eerc eerg eero egbe egbu egcc egcg egcr egec egee eger eggb egge eggo ego- egor egre ekco ekeb ekek eker ekur eore erbb erbe ercc erce ereb erec erer erg- ergg ergo erke erob eroc eroe eroo errc erre erro erub eruc erur eubc euer euge eur- eurc eure euro gbbo gc-c gcbc gccc gcrg gebe gece geck geek geer gege gegg gego geko geo- geog gerb gere gero geru geue gggg gobe gobo goce gocr goer gogo goke goku goog gook goor gorb gore gorg goro gorr gou- goug gouk gour grbr grcc grce greb grec gree greg greu grob groc grog grok groo gror grou grrr grub grue grug grur gubb gubu guck guer gugb guge gugg gugu gurb gure gurg gurk guro gurr guru kbbb kbbc kbbe kbbg kbbk kbbo kbbr kbbu kbcb kbce kbck kbco kbcr kbcu kbeb kbec kbee kbek kbeo kber kbgb kbge kbgg kbgo kbgr kbkb kbkg kbkk kbko kbkr kbob kboc kboe kbok kboo kbrb kbrc kbre kbrg kbrk kbro kbru kbub kbuc kbue kbuk kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kceb kcec kcee kceg kceo kceu kcgc kcgr kckc kckk kcko kckr kcob kcoe kcog kcor kcou kcrc kcrg kcro kcrr kcru kcub kcue kcuk kebb kebc kebe kebr kebu kecg keck keco kecr keek keer kege kegg kegk kegr kekb kekc keke keko keku keok ker- kerb kerc kere kerk kero kerr keru keug keur kgbb kgbc kgbr kgcb kgcc kgce kgcr kgeb kgec kgeo kggg kggo kggr kgoe kgor kgou kgrb kgrc kgre kgrg kgrk kgro kgrr