-er b-u bbb bbc bbe bbk bbo bbq bbr bbu bcb bcc bce bck bco bcq bcr bcu be- beb bec bee bek beo beq ber beu bkb bkc bke bkk bko bkq bkr bob boc boe bok boo boq bor bou bqc bqe brb bre brk bro brq brr bru bub buc bue buk buo bur buu c-- cbb cbc cbe cbk cbo cbq cbr cbu ccb ccc cce cck cco ccr ccu ce- ceb cec cee cek ceo ceq cer ceu ckb ckc cko co- cob coc coe cok coo coq cor cou cqb cqc cqo crb crc cre crk cro crq crr cru cub cuc cue cuk cuo cuq cur cuu ebb ebc ebe ebk ebo ebq ebr ebu ec- ecb ecc ece eck eco ecq ecr ecu eeb eec eee eek eeo eer ekb ekc eke eko ekr eku eo- eob eoc eoe eok eoo eoq eor eou eqe eqq equ erb erc ere erk ero erq err eru eu- eub euc eue eur kbb kbc kbe kbk kbo kbr kbu kcb kcc kce kck kcr kcu ke- keb kec kee kek keo ker kkb kkc kke kkk kkr kku kob koc koe kok koo kor kou krc krk kro krr kru kub kuc kue kuk kur kuu ob- obb obc obe obk obo obr obu oc- ocb occ ock oco ocr ocu oeb oec oee oeo oer okb okc oke okk oko okr oku oo- oob ooc ook ooo oor oqb oqo or- orb orc ore ork oro orr oru ou- ouc oue ouk ouo our qbc qbe qbq qcc qco qec qee qeo qoo qor qqk qqq qqu qrb qrc qre qru qu- que quo qur rbb rbc rbe rbk rbo rbr rbu rcb rcc rce rco rcr rcu re- reb rec ree rek reo req rer reu rkb rkc rke rkk rko rku rob roc roe rok roo ror rou rqc rrb rrc rrk rrq rrr rru rub ruc rue ruk ruo rur ruu ubb ubc ube ubk ubo ubr ubu ucb ucc uce uck uco ucr ucu ueb uec uee uer ukb ukc uke ukk ukr uku uob uoc uoe uok uoo uor ur- urb urc ure urk uro urr uru uuc uue uur uuu

bbbb bbbq bbeb bbrc bcbc bccc bcec bcer bcor bcru bcuc bebb bebe bebo beck becu beeb beek beer beke beko beo- beok beor berc bere berk bero berr beru beuk beur bobb bobe bobo bobu boce bock boco bocq bocu boec boee boeo boer boke boko boku boob booc booe book boor boqe bor- bore bork boro borr boru boue bouk bour bque brcb brce breb brec bree brek breo brer brkb brob broc broe brok broo bror brou brrr bruc brue bubb bube bubo bubq bubu bucc buce buck buco bucu buer bueu buke bukk buko buku bur- burb bure burk buro burr buru c-bo cbbc cbcc cbce cbcr cbcu cbec cbee cber cbko cbkr cboq cbre ccbc cccb cccc cccu ccee ccob ccoc ccrc ccre ccuc cebu cec- cece ceco ceeb ceec ceke ceor ceou cer- cerc cere cero ckbc ckbe ckck ckco cker ckob ckoc ckoo ckor ckrc cobb cobe cobo cobu coce cock coco cocu cok- coke coko coob cook cor- corb corc core cork coro corr coub coue couk cour crbc crbu crcc crce crcr cre- creb crec cree creo creu crkc crob croc croe crok croo cror crub crue cruk cub- cubb cube cucc cuce cuck cucq 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- ecou ecrc ecrr ecru eeee eeke eeoc eerc eero ekco ekeb ekek eker ekur eore equ- eque equo erbb erbe ercc erce ereb erec erer erke erob eroc eroe eroo errc erre erro erub eruc erur eubc euer eur- eurc eure euro kbbb kbbc kbbe kbbk kbbo kbbr kbbu kbcb kbce kbck kbco kbcq kbcr kbcu kbeb kbec kbee kbek kbeo kber kbkb kbkk kbko kbkr kbob kboc kboe kbok kboo kboq kbqb kbqr kbrb kbrc kbre kbrk kbro kbrq kbru kbub kbuc kbue kbuk kbur kbuu kcbc kcbk kcbq kcbr kcbu kccb kccc kcck kccr kccu kceb kcec kcee kceo kceu kckc kckk kcko kckr kcob kcoe kcor kcou kcqq kcrc kcro kcrr kcru kcub kcue kcuk kebb kebc kebe kebr kebu keck keco kecr keek keer kekb kekc keke keko keku keok keqb ker- kerb kerc kere kerk kero kerr keru keur kkbb kkbe kkbo kkbq kkbr kkcb kkck kkco kkcq kkcr kkeq kkkk kkob kkoo kkor kkqq kkrb kkrc kkre kkrk kkro kkrq kkrr kkuu kobb kobc kobe kobk kobo kobr kobu kocb kock kokb kokc koke kokk koko kokr koku koob kooc kook kooo kooq koor koou korb korc kore kork koro korq korr koru koub koue kour kouu kqbb kqbk kqbo kqbr kqbu kqck kqco kqcr kqeo kqeq kqkk kqob kqor kqqk kqqq kqrk kqrq kqrr kque kqur krbb krbe krbk krbq krbr krcb krcc krce krco krcq krcu kreb krec kree krek kreo kreu krkc krke krkk krko krkq krkr krku krob kroc kroe krok kroo kror krqb krqe krqk krqq krqr krqu krrb krrc krre krrk krro krrq krrr kruc krue kruk krur kubb kubc kube kubo kubq kubr kubu kucb kucc kuce kuco kucr kuek kueu kuke kukk kuku kuok kuoo kuqo kuqq kurb kure kurk kuro kurq kurr kuru kuub kuuk kuur kuuu o-eo obbo obec ober obkb oboe obok oboq obor obre obro ocbc occc oce ocee ocke ocre ocro ocrr ocur oec- oecc oeec oere okcu oker okko okok okor okre okro okur oobe oocr ooer ooku oooo oore oque orbb orbe orbo orbu orce orco ore- oreb orec orek oreo orer orke orko oro- oroe orok oror orro orub oucc ouer our- oure ouro ouu- q-be qcue qere qero qerq qobu qoob qore qqqq qube qubo qucu quee quek quer quob quoc quok quor quro quu- rbbb rbbr rcbc rcbo rccb rccc rebb rebe