a-a a-b a-c aaa aab aac aak aao aar ab- aba abb abc abk abo abr ac- aca acb acc ack aco acr aka akb akc akk ako akr aoa aob aoc aok aoo aor ar- ara arb arc ark aro arr baa bab bac bak bao bar bba bbb bbc bbk bbo bbr bca bcb bcc bck bco bcr bka bkb bkc bkk bko bkr boa bob boc bok boo bor bra brb brk bro brr c-- caa cab cac cak cao car cba cbb cbc cbk cbo cbr cca ccb ccc cck cco ccr cka ckb ckc cko co- coa cob coc cok coo cor cra crb crc crk cro crr ka- kaa kab kac kak kao kar kba kbb kbc kbk kbo kbr kca kcb kcc kck kcr kkb kkc kkk kkr koa kob koc kok koo kor kra krc krk kro krr oaa oab oac oak oao oar ob- oba obb obc obk obo obr oc- oca ocb occ ock oco ocr oka okb okc okk oko okr oo- ooa oob ooc ook ooo oor or- ora orb orc ork oro orr ra- raa rab rac rak rao rar rba rbb rbc rbk rbo rbr rca rcb rcc rco rcr rkb rkc rkk rko roa rob roc rok roo ror rra rrb rrc rrk rrr

a-ak a-ok aaaa aaab aaac aaar aaba aabb aabc aaca aacb aacc aack aaco aacr aaka aaoo aara aarc aaro abaa abab abac abak abar abb- abba abbb abbo abbr abca abcb abcc abcr aboa abob abok aboo abor abra abrc abro acaa acab acac acar acba acca accc acco acoa acor acr- acra acrc acro acrr akaa akao akar akca akka akko akok akr- akra aoba aoca aora aorb arab arac arak arar arba arc- arca arco arka arko aroa arob aroo aror arr- arra arrc arrk arro arrr baaa baak baar baba babb babo babr bac- baca bacc back baco bak- baka bako bakr bar- bara barb barc bark baro barr bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra boab boac boak boar boba bobb bobo boca bock boco boka boko boob booc book boor bor- bora bork boro borr brab brac brak brao brca brcb brka brkb broa brob broc brok broo bror brrr c-bo caaa caab caac caba cabo cac- caca cacc cack caco cacr caka caor cara carb carc cark caro carr cbac cbar cbbc cbca cbcc cbcr cbka cbko cbkr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccob ccoc ccra ccrc ckac ckbc ckck ckco ckoa ckob ckoc ckoo ckor ckrc coak coba cobb cobo coca cock coco cok- coka coko coob cook cor- cora corb corc cork coro corr crab crac crar crbc crca crcc crcr crkc crob croc crok croo cror kaaa kaab kaak kaar kaba kabb kabc kabo kabr kacb kacc kaco kaka kakc kakk kako kaoa kaoc kaok kaor kara karb kark karo karr kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbo kbbr kbca kbcb kbck kbco kbcr kbkb kbkk kbko kbkr kboa kbob kboc kbok kboo kbra kbrb kbrc kbrk kbro kcaa kcab kcac kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kckc kckk kcko kckr kcob kcor kcrc kcro kcrr kkaa kkac kkar kkba kkbb kkbo kkbr kkcb kkck kkco kkcr kkkk kkoa kkob kkoo kkor kkrb kkrc kkrk kkro kkrr koab koac koak koar koba kobb kobc kobk kobo kobr koca kocb kock koka kokb kokc kokk koko kokr koob kooc kook kooo koor kora korb korc kork koro korr krab krac krak krar krba krbb krbk krbr krca krcb krcc krco krka krkc krkk krko krkr kroa krob kroc krok kroo kror krrb krrc krrk krro krrr oara obak obba obbo obkb obok obor obra obro ocab ocac ocak ocbc occa occc ocra ocro ocrr okak okka okko okok okor okra okro ooaa ooak ooba oocr oooo oora orab orac orak orao orar orba orbb orbo orca orco orka orko oro- orok oror orra orro raab raak raba rabb rabk rabo rac- raca racc rack raco raka rakk raob raoc raok rara rarb rark raro rbbb rbbr rcac rcbc rcbo rccb rccc roab roak roar rob- roba robb robo roca rocc rock roco roka rokk roko rokr roob rook roor rora rorc rork roro rrrr

-aaa- aaaoc aaarc aabaa aabba aabra aacbc aakko abaab ababa abaca aback abaco abaka abako abara abbac abbar abccc abkar abkoo aboab abobo abook abora aborc abrac abrak abrar acaca acacb acack acar- acara accra acock acook acork acrab acro- acrob akaba akabo akaoa akbar akkra akobo akoka akoko akrak akrar akro- ar-ab ara-c arab- araba arabo araca arack araco arara arbab arbar arbok arbor arcoa arcor arkar aroab aroar aroba arock aroor arora arrak b-r-k babak babar babka baboo babra bacab bacao bacar bacca bacco back- backa bakar bakka bakoa bakra bakrc baoro baraa barab barac barak barao barar barba barca barco bark- barka baro- baroa barok baroo baror barra barro bbook bcock bo-bo boaco boaro bobac bobak bobar bobko boboc bobok bobr bocac bocao bocar bocca bocka bocoa bocor bokaa bokko bokok bokor booba boock booco booko boora borac borak borba borbo borca borck borka borko boro- boroa borok boroo borra borro braak braca bracc brack braco brako brcko broak brobo broca brock brook brora brrar brrrr c-a-c c-cor ca-ca caaba cabob caboc cabok cabra cacak cacao caco- cacoa cakra caoba caraa carab carac carak carb- carbo carck cark- caroa carob carra carro ccccc co-bo co-co coarb coarc cobar cobra cocao cocc- cocco cocka cocoa cokak cokar cokk- cooba corak corba corbo corca coro- corra craba crabb crack craco croak crock croco crook k-a-o k-car k-rab k-rob kaaba kabaa kabab kabak kabar kabba kabob kabro kacar kakao kakar kakka kakko kako- kakra kaooa karak karka karob karok karoo ko-ko koara kobar kobra kocab kocak kokab kokak kokka kokko kokor kokra kooba kooka korab korak korba korbo korca korck koroa koror korra korro kraak kraar krack kraka krock o-r-b oarac oaror obaba obara obock