a-a a-b a-c aaa aab aac aan aao aar aau ab- aba abb abc abn abo abr abu ac- aca acb acc acn aco acr acu an- ana anb anc ann ano anr anu aoa aob aoc aon aoo aor aou ar- ara arb arc arn aro arr aru au- aua aub auc aun auo aur b-u baa bab bac ban bao bar bau bba bbb bbc bbn bbo bbr bbu bca bcb bcc bcn bco bcr bcu bna bnb bnc bnn bno bnr bnu boa bob boc bon boo bor bou bra brb brn bro brr bru bua bub buc bun buo bur buu c-- caa cab cac can cao car cau cba cbb cbc cbn cbo cbr cbu cca ccb ccc ccn cco ccr ccu cn- cna cnb cnc cnn cno cnr cnu co- coa cob coc con coo cor cou cra crb crc crn cro crr cru cua cub cuc cun cuo cur cuu naa nab nac nan nao nar nau nba nbb nbc nbn nbo nbr nbu nca ncb ncc ncn nco ncr ncu nna nnb nnc nnn nno nnu no- noa nob noc non noo nor nou nra nrb nrc nrn nro nrr nru nua nub nuc nun nuo nur nuu oaa oab oac oan oao oar oau ob- oba obb obc obn obo obr obu oc- oca ocb occ ocn oco ocr ocu on- ona onb onc onn ono onr onu oo- ooa oob ooc oon ooo oor or- ora orb orc orn oro orr oru ou- oua ouc oun ouo our ra- raa rab rac ran rao rar rau rba rbb rbc rbn rbo rbr rbu rca rcb rcc rcn rco rcr rcu rna rnb rnc rnn rno rnr rnu roa rob roc ron roo ror rou rra rrb rrc rrn rrr rru rua rub ruc run ruo rur ruu ua- uaa uab uac uan uao uar uau uba ubb ubc ubn ubo ubr ubu uca ucb ucc ucn uco ucr ucu un- una unb unc unn uno unr unu uoa uob uoc uon uoo uor ur- ura urb urc urn uro urr uru uua uuc uun uur uuu

-ana a-un aaaa aaab aaac aaan aaar aaba aabb aabc aaca aacb aacc aacn aaco aacr aacu aana aaon aaoo aara aarc aaro aaru abaa abab abac aban abar abau abb- abba abbb abbo abbr abca abcb abcc abcn abcr abnu aboa abob abon aboo abor abou abra abrc abro abua abun acaa acab acac acan acar acba acca accc acco accu acoa acon acor acou acr- acra acrc acro acrr acu- acuo acur ana- anaa anab anac anan anao anar anau anba anbb anbo anbu anca ancc anco anna annb anno ano- anoa anon anor anrc anua anub anun aoba aoca aonb aono aora aorb aorn aoun arab arac aran arar arau arba arc- arca arco arna arno aroa arob aron aroo aror arr- arra arrc arro arrr arru arua arub arun auaa auca auna aur- aura auro baaa baan baar baba babb babo babr babu bac- baca bacc bacn baco bana banc bann bano banr banu baon bar- bara barb barc barn baro barr baru bau- baur bbau bbbb bbrc bcaa bcar bcbc bcca bccc bcnu bcor bcra bcru bcuc bnoc bnor bnrr boab boac boan boar boba bobb bobo bobu boca boco bocu bona bonc bonn bono bonu boob booc boon boor bor- bora born boro borr boru boua boun bour brab brac bran brao brau brca brcb brna brno broa brob broc bron broo bror brou brrr bruc brun buar buba bubb bubo bubu buca bucc buco bucu buna bunb bunn buno bunu buon bur- bura burb burn buro burr buru c-bo caaa caab caac caan caba cabo cabu cac- caca cacc caco cacr cana canc cann cano caor cara carb carc carn caro carr cauc cauo cbac cbar cbbc cbca cbcc cbcn cbcr cbcu cbna cbrn ccaa ccab ccac ccar ccba ccbc ccbn ccca cccb cccc cccu ccna ccnb ccnc ccnr ccnu ccob ccoc ccra ccrc ccuc cnaa cnac cnbc cnco cnna cnrc cnrr coan coba cobb cobo cobu coca coco cocu con- cona conc conn cono coob coon cor- cora corb corc corn coro corr coua coub coun cour crab crac cran crar crau crbc crbu crca crcc crcr crna crob croc cron croo cror crub crun cuan cuau cub- cuba cubb cuca cucc cucn cuna cuno cuon cura curb curn curo curr naaa naab naac naan naar naba nabc nabo nabu naca nacc naco nan- nana nanb nann nano nanu naoc naor nara narc narn naro narr naru nauo naur nbaa nbar nbbc nbbo nbca nbcc nbco ncaa ncac ncar ncba ncbc ncca nccc nccn nccr nccu ncna ncnc ncoa ncoc ncor ncra ncrc ncua nnnn noaa noac noba nobc nobo nobu noco non- nona nonn nono nonu noo- noob noon nooo noor nor- nora norb norc norn noro norr noun nour nrab nrca nrna nroc nron nrrc nuan nuba nubc nuca nucu nuna nunc nunn nuno nuoc nuon nura nurc nurn nurr nuru oaau oara oban obba obbo obon obor obra obro ocab ocac ocan ocbc occa occc occn ocna ocon ocra ocro ocrr ocur onab onan onar onc- onca onco onna onno onon onor onra onur ooaa ooba oocr oona oooo oora orab orac oran orao orar orba orbb orbo orbu orca orco orna ornc orno oro- oron oror orra orro orub ouac ouan oucc oun- ouna our- oura ourn ouro ouu- raab raan raba rabb rabo rabu rac- raca racc raco racu rana ranc rann rano raob raoc rara rarb raro raua raub rauc raun rbbb rbbr rcac rcbc rcbo rccb rccc rcnr rcon rnbr rnco roab roan roar rob- roba robb robo robu roca rocc roco rona ronc rono roob roon roor rora rorc roro roru roua roub roun rrna rrrr rrun ruan ruba rubb rubu ruca runa runc runn runo rura rurc ruro ruru ruun uabc uaca uaoc uarc uaru uaua ubac ubar ubba ubbo uboc ubon ubra ucan ucar ucbc ucca