a-a a-b a-c aaa aab aac aah aak aao aar ab- aba abb abc abh abk abo abr ac- aca acb acc ach ack aco acr aha ahb ahc ahh ahk aho ahr aka akb akc akh akk ako akr aoa aob aoc aoh aok aoo aor ar- ara arb arc arh ark aro arr baa bab bac bah bak bao bar bba bbb bbc bbh bbk bbo bbr bca bcb bcc bch bck bco bcr bha bhb bhc bhh bhk bho bhr bka bkb bkc bkk bko bkr boa bob boc boh bok boo bor bra brb brh brk bro brr c-- caa cab cac cah cak cao car cba cbb cbc cbh cbk cbo cbr cca ccb ccc cch cck cco ccr ch- cha chb chc chh chk cho chr cka ckb ckc ckh cko co- coa cob coc coh cok coo cor cra crb crc crh crk cro crr haa hab hac hah hak hao har hba hbb hbc hbh hbk hbo hbr hca hcb hcc hch hck hco hcr hha hhb hhc hhh hhk hho hhr hka hkb hkh hkk hko hkr hoa hob hoc hoh hok hoo hor hr- hra hrb hrc hrh hrk hro hrr ka- kaa kab kac kah kak kao kar kba kbb kbc kbh kbk kbo kbr kca kcb kcc kch kck kcr kha khh khk kho khr kkb kkc kkh kkk kkr koa kob koc koh kok koo kor kra krc krk kro krr oaa oab oac oah oak oao oar ob- oba obb obc obh obk obo obr oc- oca ocb occ och ock oco ocr oha ohc ohh oho ohr oka okb okc okk oko okr oo- ooa oob ooc ooh ook ooo oor or- ora orb orc orh ork oro orr ra- raa rab rac rah rak rao rar rba rbb rbc rbh rbk rbo rbr rca rcb rcc rch rco rcr rh- rha rhb rhc rhh rho rhr rkb rkc rkk rko roa rob roc roh rok roo ror rra rrb rrc rrh rrk rrr

a-ak a-ha a-ok aaaa aaab aaac aaah aaar aaba aabb aabc aabh aaca aacb aacc aach aack aaco aacr aaha aahk aaka aaoo aara aarc aaro abaa abab abac abak abar abb- abba abbb abbo abbr abca abcb abcc abch abcr abha abho abhr aboa abob aboh abok aboo abor abra abrc abro acaa acab acac acar acba acca accc acch acco acha achh acho achr acoa acoh acor acr- acra acrc acro acrr ahab ahac ahah ahar ahha ahoa ahok ahor ahra ahrc ahrr akaa akah akao akar akca akha akka akko akok akr- akra aoah aoba aoca aora aorb arab arac arah arak arar arba arbh arc- arca arch arco arh- arka arkh arko aroa arob aroo aror arr- arra arrc arrh arrk arro arrr baaa baah baak baar baba babb babo babr bac- baca bacc bach back baco baha baho bahr bak- baka bakh bako bakr baoh bar- bara barb barc barh bark baro barr bbbb bbch bbrc bcaa bcar bcbc bcca bccc bcor bcra bhao bhar bhca bhcc bhor bhra boab boac boak boar boba bobb bobo boca boch bock boco boha boho bohr boka boko boob booc booh book boor bor- bora borh bork boro borr brab brac brah brak brao brca brcb brka brkb broa brob broc broh brok broo bror brrr c-bo caaa caab caac caah caba cabo cac- caca cacc cach cack caco cacr caha caka caor cara carb carc cark caro carr cbac cbar cbbc cbca cbcc cbcr cbha cbka cbko cbkr cbrh ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccha cchr ccob ccoc ccra ccrc chaa chab chac chah chak chao char chca chch chha chka chkb choc choh chok choo chor chra chrb chrc chro chrr ckac ckbc ckch ckck ckco ckoa ckob ckoc ckoo ckor ckrc coak coba cobb cobh cobo coca coch cock coco coha coho cok- coka coko coob cooh cook cor- cora corb corc cork coro corr crab crac crar crbc crca crcc crcr crkc crob croc croh crok croo cror haab haak haar haba habo hack haco haha haho haka hakk hako haor hara harc harh hark haro harr hbar hboc hcbc hcca hccb hccc hcch hhaa hhhh hkcc hoac hoar hoba hobo hoca hoch hock hocr hoha hoho hoka hoko hook hoor hora horc hork horo horr hrac hrob hrrc kaaa kaab kaak kaar kaba kabb kabc kabo kabr kacb kacc kach kaco kaha kahc kaho kahr kaka kakc kakh kakk kako kaoa kaoc kaok kaor kara karb kark karo karr kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbo kbbr kbca kbcb kbch kbck kbco kbcr kbhb kbhc kbhh kbhr kbkb kbkk kbko kbkr kboa kbob kboc kbok kboo kbra kbrb kbrc kbrh kbrk kbro kcaa kcab kcac kcah kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcha kchh kchk kcho kchr kckc kckk kcko kckr kcob kcoh kcor kcrc kcrh kcro kcrr khab khac khak khao khar khbc khbr khca khcb khcc khch khck khhk khho khka khkk khkr khoa khob khoc khok khor khra khrk khro khrr kkaa kkac kkar kkba kkbb kkbo kkbr kkcb kkch kkck kkco kkcr kkha kkhb kkhh kkhk kkhr kkkk kkoa kkob kkoh kkoo kkor kkrb kkrc kkrh kkrk kkro kkrr koab koac koak koar koba kobb kobc kobk kobo kobr koca kocb koch kock koha kohh koho kohr koka kokb kokc kokh kokk koko kokr koob kooc kook kooo koor kora korb korc kork koro korr krab krac krah krak krar krba krbb krbk krbr krca krcb krcc krch krco krhc krka krkc krkh krkk krko krkr kroa krob kroc kroh krok kroo kror krrb krrc krrk krro krrr oara obak obba obbo obkb obok obor obra obrh obro ocab ocac ocak ocbc occa occc ocha ocra ocro ocrr ohba ohcc ohho ohob ohoh ohok ohra okak okha okka okko okok okor okra okro ooaa ooak ooba oocr ooha ooho oooh oooo oora orab orac orah orak orao orar orba