-er a-a a-b a-c aaa aab aac aae aak aao aar aau ab- aba abb abc abe abk abo abr abu ac- aca acb acc ace ack aco acr acu aea aeb aec aee aek aeo aer aeu aka akb akc ake akk ako akr aku aoa aob aoc aoe aok aoo aor aou ar- ara arb arc are ark aro arr aru au- aua aub auc aue auk auo aur b-u baa bab bac bae bak bao bar bau bba bbb bbc bbe bbk bbo bbr bbu bca bcb bcc bce bck bco bcr bcu be- bea beb bec bee bek beo ber beu bka bkb bkc bke bkk bko bkr boa bob boc boe bok boo bor bou bra brb bre brk bro brr bru bua bub buc bue buk buo bur buu c-- caa cab cac cae cak cao car cau cba cbb cbc cbe cbk cbo cbr cbu cca ccb ccc cce cck cco ccr ccu ce- cea ceb cec cee cek ceo cer ceu cka ckb ckc cko co- coa cob coc coe cok coo cor cou cra crb crc cre crk cro crr cru cua cub cuc cue cuk cuo cur cuu eaa eab eac eae eak eao ear eau eba ebb ebc ebe ebk ebo ebr ebu ec- eca ecb ecc ece eck eco ecr ecu eea eeb eec eee eek eeo eer eka ekb ekc eke eko ekr eku eo- eoa eob eoc eoe eok eoo eor eou era erb erc ere erk ero err eru eu- eua eub euc eue eur ka- kaa kab kac kae kak kao kar kau kba kbb kbc kbe kbk kbo kbr kbu kca kcb kcc kce kck kcr kcu ke- kea keb kec kee kek keo ker kkb kkc kke kkk kkr kku koa kob koc koe kok koo kor kou kra krc krk kro krr kru kub kuc kue kuk kur kuu oaa oab oac oae oak oao oar oau ob- oba obb obc obe obk obo obr obu oc- oca ocb occ ock oco ocr ocu oea oeb oec oee oeo oer oka okb okc oke okk oko okr oku oo- ooa oob ooc ook ooo oor or- ora orb orc ore ork oro orr oru ou- oua ouc oue ouk ouo our ra- raa rab rac rae rak rao rar rau rba rbb rbc rbe rbk rbo rbr rbu rca rcb rcc rce rco rcr rcu re- rea reb rec ree rek reo rer reu rkb rkc rke rkk rko rku roa rob roc roe rok roo ror rou rra rrb rrc rrk rrr rru rua rub ruc rue ruk ruo rur ruu ua- uaa uab uac uae uak uao uar uau uba ubb ubc ube ubk ubo ubr ubu uca ucb ucc uce uck uco ucr ucu uea ueb uec uee uer uka ukb ukc uke ukk ukr uku uoa uob uoc uoe uok uoo uor ur- ura urb urc ure urk uro urr uru uua uuc uue uur uuu

a-ak a-be a-ok aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aack aaco aacr aacu aaea aaec aaka aake aaku aaoe aaoo aara aarc aare aaro aaru abaa abab abac abae abak abar abau abb- abba abbb abbe abbo abbr abca abcb abcc abcr abec abee aber aboa abob abok aboo abor abou abra abrc abro abua abue abuk acaa acab acac acae acar acba acca accc acce acco accu ace- acea acec acek acer acke acoa acoe acor acou acr- acra acrc acre acro acrr acu- acue acuo acur aeac aecb aeer aeka aer- aera aerc aero akaa akae akao akar akca akee aker akeu akka akko akku akok akr- akra akre akua aoba aoca aoce aoeu aora aorb arab arac arae arak arar arau arba arbe arc- arca arce arco area arec aree arek areo areu arka arke arko aroa arob aroe aroo aror arr- arra arrc arre arrk arro arrr arru arua arub arue auaa aube auca auce auer auke aur- aura aure auro baaa baak baar baba babb babe babo babr babu bac- baca bacc bace back baco baek baer bak- baka bake bako bakr baku bar- bara barb barc bare bark baro barr baru bau- bauk baur bbau bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcor bcra bcru bcuc beak bear beau beba bebb bebe bebo beca beck becu beeb beek beer beka beke beko beo- beok beor bera berc bere berk bero berr beru beuk beur boab boac boak boar boba bobb bobe bobo bobu boca boce bock boco bocu boea boec boee boeo boer boka boke boko boku boob booc booe book boor bor- bora bore bork boro borr boru boua boue bouk bour brab brac brae brak brao brau brca brcb brce brea breb brec bree brek breo brer brka brkb broa brob broc broe brok broo bror brou brrr bruc brue buar buba bubb bube bubo bubu buca bucc buce buck buco bucu buea buer bueu buka buke bukk buko buku bur- bura burb bure burk buro burr buru c-bo caaa caab caac caba cabe cabo cabu cac- caca cacc cace cack caco cacr caec caer caeu caka cake caor cara carb carc care cark caro carr cauc cauk cauo cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbea cbec cbee cber cbka cbko cbkr cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccee ccob ccoc ccra ccrc ccre ccuc ceac cear ceba cebu cec- ceca cece ceco ceeb ceec ceke ceor ceou cer- cera cerc cere cero ckac ckbc ckbe ckck ckco cker ckoa ckob ckoc ckoo ckor ckrc coak coba cobb cobe cobo cobu coca coce cock coco cocu cok- coka coke coko coob cook cor- cora corb corc core cork coro corr coua coub coue couk cour crab crac crar crau crbc crbu crca crcc crce crcr cre- crea creb crec cree creo creu crkc crob croc croe crok croo cror crub crue cruk cuau cub- cuba cubb cube