a-ak a-ok aaaa aaab aaac aaaf aaar aaas aaba aabb aabc aaca aacb aacc aacf aack aaco aacr aacs aafa aafb aafc aaff aaka aaoo aara aarc aaro aars aasa aasc aasf aass abaa abab abac abaf abak abar abas abb- abba abbb abbo abbr abbs abca abcb abcc abcf abcr abcs abff aboa abob abof abok aboo abor abos abra abrc abro abrs abs- absa absf abss acaa acab acac acar acas acba acca accc accf acco accs acfc acfs acks acoa acor acos acr- acra acrc acro acrr acrs acsa acsc acss afaa afak afao afar afbs afca afcb afcc afcs affa affc affo affs afka afkr afoa afoo afor afr- afra afrc afro afrs afsa afsb afsc akaa akao akar akas akca akka akko akok akos akr- akra aksa aoba aoca aocs aoks aora aorb aors aoss arab arac araf arak arar aras arba arbs arc- arca arco arcs arfa arfb arfc arff arfs arka arko arks aroa arob aroo aror aros arr- arra arrc arrk arro arrr arrs ars- arsa arsc arsk arso asaa asab asac asaf asak asao asar asas asba asbo asc- asca ascb ascc asco ascr asfa aska asko askr asks asob asoc asof asok asor asos asra asrc asro asrs assa assc assk asso assr asss baaa baaf baak baar baas baba babb babo babr babs bac- baca bacc back baco bacs bafc baff bafo bak- baka bako bakr baks baos bar- bara barb barc barf bark baro barr bars basa basc basf bask baso bass bbas bbbb bbbs bbfc bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcfc bcof bcor bcos bcra bcrs bcsa bcsc bcss bfas bfca bfcs bffs bfsr boab boac boak boar boas boba bobb bobo bobs boca bock boco bocs bofa boff bofs boka boko boks boob booc boof book boor boos bor- bora borf bork boro borr bors bosa bosc bosk boso boss brab brac braf brak brao bras brca brcb brfc brka brkb broa brob broc brok broo bror bros brrr brrs brsb brsr bsaa bsac bsas bscs bsfa bsfc bsff bsfs bsos bsra bssc c-bo caaa caab caac caaf caas caba cabf cabo cabs cac- caca cacc cack caco cacr cafa cafb cafc caff cafs caka caor caos cara carb carc carf cark caro carr cars casa casb casc cask caso casr cass cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbfb cbfc cbka cbko cbkr cbsa cbsc ccaa ccab ccac ccaf ccar ccas ccba ccbc ccca cccb cccc cccf cccs ccfa ccfc ccff ccob ccoc ccra ccrc ccrf ccrs ccsa ccsf ccss cfaa cfab cfac cfao cfar cfbc cfbr cfbs cfca cfcb cfcf cfco cfcs cffb cffr cfoa cfor cfos cfra cfrb cfsa ckac ckbc ckck ckco ckcs ckfr ckoa ckob ckoc ckoo ckor ckos ckrc cksa cksb ckso coak coas coba cobb cobo cobs coca cock coco cofc coff cofs cok- coka coko coob coof cook coos cor- cora corb corc corf cork coro corr cors cosa cosc coso coss crab crac craf crar cras crbc crca crcc crcr crfc crfs crkc crob croc crok croo cror crsa crss csaa csab csac csak csao csar csas csbf cscb cscc cscf csco cscr cscs csfc csfr cska csks csob csor csos csra csrc csrs cssa cssr f--k faaa faac faas faba fabo fabs faca facc fack facs fafa fafc faff fafo fako fara farb farc fark faro farr fars fasa fasc faso fass fbar fbrs fcab fcar fcas fcba fcbs fcca fccf fcra fcsc ffar ffcc ffff ffrr ffsa ffss fkab foaf foak foar foba fobs foca fock foco focs fofo foof fook foos for- fora forb fork foro forr fors fosa fosb foso foss frab frac frak fras frbc frcc frfc frob fros frsb frsc frso fsas fscb fscc fsck fsfo fsra fssa fssc fssf k-os kaaa kaab kaaf kaak kaar kaas kaba kabb kabc kabf kabo kabr kacb kacc kaco kacs kafa kafc kaff kafr kafs kaka kakc kakk kako kaks kaoa kaoc kaok kaor kaos kara karb karf kark karo karr kars kas- kasa kasb kasc kasf kask kaso kasr kass kbaa kbab kbac kbak kbar kbas kbba kbbb kbbc kbbf kbbk kbbo kbbr kbbs kbca kbcb kbck kbco kbcr kbcs kbfb kbfc kbff kbfk kbfo kbfr kbfs kbkb kbkf kbkk kbko kbkr kboa kbob kboc kbok kboo kbos kbra kbrb kbrc kbrf kbrk kbro kbsa kbsb kbsk kbso kbsr kbss kcaa kcab kcac kcar kcas kcba kcbc kcbf kcbk kcbr kcbs kcca kccb kccc kcck kccr kcfa kcfb kcfc kcfo kckc kckf kckk kcko kckr kcob kcof kcor kcos kcrc kcro kcrr kcrs kcsa kcsb kcsc kcsf kcsr kcss kfab kfac kfar kfbc kfbk kfcf kfco kfcr kfcs kffa kffb kfff kffk kfka kfkb kfok kfoo kfor kfra kfrc kfro kfrr kfrs kfsa kfsk kfsr kkaa kkac kkar kkba kkbb kkbo kkbr kkbs kkcb kkck kkco kkcr kkcs kkfr kkfs kkkk kkoa kkob kkoo kkor kkrb kkrc kkrf kkrk kkro kkrr kkrs kksa kksf kksr kkss koab koac koak koar koas koba kobb kobc kobk kobo kobr kobs koca kocb kocf kock kocs kofa kofc koff kofk kofo koka kokb kokc kokf kokk koko kokr koks koob kooc kook kooo koor koos kora korb korc korf kork koro korr kors kos- kosa kosb kosc kosf koso kosr koss krab krac krak krar kras krba krbb krbk krbr krca krcb krcc krco krcs krfc krff krfo krfs krka krkc krkk krko krkr krks kroa krob kroc krof krok kroo kror kros krrb krrc krrf krrk krro krrr krrs krsa krsc krsf krsk krsr krss ksab ksac ksaf ksak ksar ksas ksba ksbc ksbr ksbs ksca kscb ksck ksco kscr kscs ksfa ksfb ksfc ksfo ksfr kska kskb kskf kskk ksko kskr ksks ksob ksoc ksof ksok ksoo ksor ksos ksra ksrb ksrf ksro ksrr ksrs kssa ksso kssr ksss oafc oafo oafs oaks oara oars oasc oass obak obas obba obbo obkb obok obor obos obra obro obsr obss ocab ocac ocak ocas ocbc occa occc ocfa ocks ocos