a-a a-b a-c aaa aab aac aak aan aar aau ab- aba abb abc abk abn abr abu ac- aca acb acc ack acn acr acu aka akb akc akk akn akr aku an- ana anb anc ank ann anr anu ar- ara arb arc ark arn arr aru au- aua aub auc auk aun aur b-u baa bab bac bak ban bar bau bba bbb bbc bbk bbn bbr bbu bca bcb bcc bck bcn bcr bcu bka bkb bkc bkk bkn bkr bna bnb bnc bnk bnn bnr bnu bra brb brk brn brr bru bua bub buc buk bun bur buu c-- caa cab cac cak can car cau cba cbb cbc cbk cbn cbr cbu cca ccb ccc cck ccn ccr ccu cka ckb ckc cn- cna cnb cnc cnn cnr cnu cra crb crc crk crn crr cru cua cub cuc cuk cun cur cuu ka- kaa kab kac kak kan kar kau kba kbb kbc kbk kbn kbr kbu kca kcb kcc kck kcn kcr kcu kkb kkc kkk kkn kkr kku kn- kna knc knk knn knr knu kra krc krk krn krr kru kub kuc kuk kun kur kuu naa nab nac nak nan nar nau nba nbb nbc nbk nbn nbr nbu nca ncb ncc nck ncn ncr ncu nka nkc nkk nkn nkr nku nna nnb nnc nnk nnn nnu nra nrb nrc nrk nrn nrr nru nua nub nuc nuk nun nur nuu ra- raa rab rac rak ran rar rau rba rbb rbc rbk rbn rbr rbu rca rcb rcc rcn rcr rcu rkb rkc rkk rku rna rnb rnc rnn rnr rnu rra rrb rrc rrk rrn rrr rru rua rub ruc ruk run rur ruu ua- uaa uab uac uak uan uar uau uba ubb ubc ubk ubn ubr ubu uca ucb ucc uck ucn ucr ucu uka ukb ukc ukk ukn ukr uku un- una unb unc unk unn unr unu ur- ura urb urc urk urn urr uru uua uuc uun uur uuu

-ana a-ak a-un aaaa aaab aaac aaan aaar aaba aabb aabc aaca aacb aacc aack aacn aacr aacu aaka aaku aana aara aarc aaru abaa abab abac abak aban abar abau abb- abba abbb abbr abca abcb abcc abcn abcr abnu abra abrc abua abuk abun acaa acab acac acan acar acba acca accc accu acr- acra acrc acrr acu- acur akaa akan akar akca akka akku akna akr- akra akua ana- anaa anab anac anak anan anar anau anba anbb anbu anca ancc ank- anka anku anna annb anrc anua anub anun arab arac arak aran arar arau arba arc- arca arka arna arnk arr- arra arrc arrk arrr arru arua arub arun auaa auca auna aunk aur- aura baaa baak baan baar baba babb babr babu bac- baca bacc back bacn bak- baka bakr baku bana banc bank bann banr banu bar- bara barb barc bark barn barr baru bau- bauk baur bbau bbbb bbrc bcaa bcar bcbc bcca bccc bcnu bcra bcru bcuc bnrr brab brac brak bran brau brca brcb brka brkb brna brrr bruc brun buar buba bubb bubu buca bucc buck bucu buka bukk buku buna bunb bunk bunn bunu bur- bura burb burk burn burr buru caaa caab caac caan caba cabu cac- caca cacc cack cacr caka cana canc cank cann cara carb carc cark carn carr cauc cauk cbac cbar cbbc cbca cbcc cbcn cbcr cbcu cbka cbkn cbkr cbna cbrn ccaa ccab ccac ccar ccba ccbc ccbn ccca cccb cccc cccu ccna ccnb ccnc ccnr ccnu ccra ccrc ccuc ckac ckan ckbc ckck cknb cknc ckrc cnaa cnac cnbc cnna cnrc cnrr crab crac cran crar crau crbc crbu crca crcc crcr crkc crna crub cruk crun cuan cuau cub- cuba cubb cuca cucc cuck cucn cuk- cuka cuna cura curb curn curr kaaa kaab kaak kaan kaar kaba kabb kabc kabr kabu kacb kacc kacu kaka kakc kakk kakn kaku kana kanb kann kanu kara karb kark karn karr karu kau- kaub kauc kauk kaun kaur kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbr kbbu kbca kbcb kbck kbcr kbcu kbkb kbkk kbkr kbna kbnn kbnr kbnu kbra kbrb kbrc kbrk kbrn kbru kbua kbub kbuc kbuk kbun kbur kbuu kcaa kcab kcac kcar kcau kcba kcbc kcbk kcbr kcbu kcca kccb kccc kcck kccr kccu kckc kckk kckn kckr kcnb kcnr kcrc kcrn kcrr kcru kcua kcub kcuk kkaa kkac kkan kkar kkba kkbb kkbn kkbr kkcb kkck kkcn kkcr kkkk kknb kknn kknu kkrb kkrc kkrk kkrn kkrr kkua kkuu knaa knab knac knan knar knau knba knbb knbc knbn knbr knbu knca kncb knck kncn kncr kncu knkk knnb knnk knnr knrb knrk knub knuk knur krab krac krak kran krar krba krbb krbk krbr krca krcb krcc krcn krcu krka krkc krkk krkn krkr krku krna krnb krnk krnn krnu krrb krrc krrk krrn krrr krua kruc kruk krun krur kuac kuan kuar kuau kuba kubb kubc kubr kubu kuca kucb kucc kucr kuka kukk kukn kuku kuna kunc kunk kunr kunu kura kurb kurk kurr kuru kuub kuuk kuur kuuu naaa naab naac naan naar naba nabc nabk nabu naca nacc nack naka nan- nana nanb nann nanu nara narc nark narn narr naru naur nbaa nbak nbar nbbc nbca nbcc ncaa ncac ncar ncba ncbc ncca nccc nccn nccr nccu ncna ncnc ncra ncrc ncua ncuk nkau nnnn nrab nrca nrna nrrc nuan nuba nubc nubk nuca nuck nucu nuka nuku nuna nunc nunk nunn nura nurc nurn nurr nuru nuuk raab raak raan raba rabb rabk rabu rac- raca racc rack racu raka rakk raku rana ranc rank rann rara rarb rark raua raub rauc rauk raun rbbb rbbr rcac rcbc rccb rccc rcnr rnbr rrna rrrr rrun ruan ruba rubb rubu ruca ruck ruka rukk rukn ruku runa runc runk runn rura rurc ruru ruun uabc uaca uarc uaru uaua ubac ubar ubba ubra ucak ucan ucar ucbc ucca ucka