a-a a-b a-c aaa aab aac aak aan aao aar ab- aba abb abc abk abn abo abr ac- aca acb acc ack acn aco acr aka akb akc akk akn ako akr an- ana anb anc ank ann ano anr aoa aob aoc aok aon aoo aor ar- ara arb arc ark arn aro arr baa bab bac bak ban bao bar bba bbb bbc bbk bbn bbo bbr bca bcb bcc bck bcn bco bcr bka bkb bkc bkk bkn bko bkr bna bnb bnc bnk bnn bno bnr boa bob boc bok bon boo bor bra brb brk brn bro brr c-- caa cab cac cak can cao car cba cbb cbc cbk cbn cbo cbr cca ccb ccc cck ccn cco ccr cka ckb ckc cko cn- cna cnb cnc cnn cno cnr co- coa cob coc cok con coo cor cra crb crc crk crn cro crr ka- kaa kab kac kak kan kao kar kba kbb kbc kbk kbn kbo kbr kca kcb kcc kck kcn kcr kkb kkc kkk kkn kkr kn- kna knc knk knn kno knr koa kob koc kok kon koo kor kra krc krk krn kro krr naa nab nac nak nan nao nar nba nbb nbc nbk nbn nbo nbr nca ncb ncc nck ncn nco ncr nka nkc nkk nkn nko nkr nna nnb nnc nnk nnn nno no- noa nob noc nok non noo nor nra nrb nrc nrk nrn nro nrr oaa oab oac oak oan oao oar ob- oba obb obc obk obn obo obr oc- oca ocb occ ock ocn oco ocr oka okb okc okk oko okr on- ona onb onc onk onn ono onr oo- ooa oob ooc ook oon ooo oor or- ora orb orc ork orn oro orr ra- raa rab rac rak ran rao rar rba rbb rbc rbk rbn rbo rbr rca rcb rcc rcn rco rcr rkb rkc rkk rko rna rnb rnc rnn rno rnr roa rob roc rok ron roo ror rra rrb rrc rrk rrn rrr

-ana a-ak a-ok aaaa aaab aaac aaan aaar aaba aabb aabc aaca aacb aacc aack aacn aaco aacr aaka aana aaon aaoo aara aarc aaro abaa abab abac abak aban abar abb- abba abbb abbo abbr abca abcb abcc abcn abcr aboa abob abok abon aboo abor abra abrc abro acaa acab acac acan acar acba acca accc acco acoa acon acor acr- acra acrc acro acrr akaa akan akao akar akca akka akko akna akok akon akr- akra ana- anaa anab anac anak anan anao anar anba anbb anbo anca ancc anco ank- anka anko anna annb anno ano- anoa anon anor anrc aoba aoca aonb aono aora aorb aorn arab arac arak aran arar arba arc- arca arco arka arko arna arnk arno aroa arob aron aroo aror arr- arra arrc arrk arro arrr baaa baak baan baar baba babb babo babr bac- baca bacc back bacn baco bak- baka bako bakr bana banc bank bann bano banr baon bar- bara barb barc bark barn baro barr bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra bnoc bnor bnrr boab boac boak boan boar boba bobb bobo boca bock boco boka bokn boko bona bonc bonk bonn bono boob booc book boon boor bor- bora bork born boro borr brab brac brak bran brao brca brcb brka brkb brna brno broa brob broc brok bron broo bror brrr c-bo caaa caab caac caan caba cabo cac- caca cacc cack caco cacr caka cana canc cank cann cano caor cara carb carc cark carn caro carr cbac cbar cbbc cbca cbcc cbcn cbcr cbka cbkn cbko cbkr cbna cbrn ccaa ccab ccac ccar ccba ccbc ccbn ccca cccb cccc ccna ccnb ccnc ccnr ccob ccoc ccra ccrc ckac ckan ckbc ckck ckco cknb cknc ckoa ckob ckoc ckoo ckor ckrc cnaa cnac cnbc cnco cnna cnrc cnrr coak coan coba cobb cobo coca cock coco cok- coka coko con- cona conc conk conn cono coob cook coon cor- cora corb corc cork corn coro corr crab crac cran crar crbc crca crcc crcr crkc crna crob croc crok cron croo cror kaaa kaab kaak kaan kaar kaba kabb kabc kabo kabr kacb kacc kaco kaka kakc kakk kakn kako kana kanb kann kano kaoa kaoc kaok kaon kaor kara karb kark karn karo karr kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbo kbbr kbca kbcb kbck kbco kbcr kbkb kbkk kbko kbkr kbna kbnn kbno kbnr kboa kbob kboc kbok kbon kboo kbra kbrb kbrc kbrk kbrn kbro kcaa kcab kcac kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kckc kckk kckn kcko kckr kcnb kcno kcnr kcob kcon kcor kcrc kcrn kcro kcrr kkaa kkac kkan kkar kkba kkbb kkbn kkbo kkbr kkcb kkck kkcn kkco kkcr kkkk kknb kknn kkno kkoa kkob kkon kkoo kkor kkrb kkrc kkrk kkrn kkro kkrr knaa knab knac knan knar knba knbb knbc knbn knbr knca kncb knck kncn knco kncr knkk knnb knnk knnr knob knoc knok knon knor knrb knrk knro koab koac koak koan koar koba kobb kobc kobk kobn kobo kobr koca kocb kock kocn koka kokb kokc kokk kokn koko kokr kona konc konk kono koob kooc kook koon kooo koor kora korb korc kork korn koro korr krab krac krak kran krar krba krbb krbk krbr krca krcb krcc krcn krco krka krkc krkk krkn krko krkr krna krnb krnk krnn krno kroa krob kroc krok kroo kror krrb krrc krrk krrn krro krrr naaa naab naac naan naar naba nabc nabk nabo naca nacc nack naco naka nako nan- nana nanb nann nano naoc naor nara narc nark narn naro narr nbaa nbak nbar nbbc nbbo nbca nbcc nbco ncaa ncac ncar ncba ncbc ncca nccc nccn nccr ncna ncnc ncoa ncoc ncor ncra ncrc nkok nkor nnnn noaa noac noak noba nobc nobo nock noco noko non- nona nonn nono noo- noob nook noon nooo noor