a-ak a-ok aaaa aaac aaaf aaal aaca aacc aacf aack aacl aaco aafa aafc aaff aafl aaka aala aalc aall aalo aaoo acaa acac acca accc accf acco acfc acfl acla aclc acoa acol afaa afak afao afca afcc affa affc affo afka afla aflc afoa afol afoo akaa akal akao akca akka akko aklo akok alaa alac alak alal alao alca alcc alco alfa alk- alka alko all- alla alll allo aloa aloc alof alok alol aloo aoca aola caaa caac caaf caal cac- caca cacc cack caco cafa cafc caff cafl caka cala calc calf calk call calo caol ccaa ccac ccaf ccca cccc cccf cccl ccfa ccfc ccff ccfl ccla cclc ccoc cfaa cfac cfao cfca cfcf cfcl cfco cfoa ckac ckck ckcl ckco cklf ckoa ckoc ckoo claf clof clok cloo coak coal coca cock coco cofc coff cok- coka coko col- cola colk coll colo coof cook cool f--k faaa faac faca facc fack fafa fafc faff fafo fako fala falc falk fall falo fcal fcca fccf ffcc ffff flac flak flao flcl floc flok floo foaf foak foal foca fock foco fofo fola folc folk foll folo foof fook fool k-lo kaaa kaaf kaak kaal kacc kacl kaco kafa kafc kaff kaka kakc kakk kako kala kalc kalf kalk kall kalo kaoa kaoc kaok kaol kcaa kcac kcal kcca kccc kcck kccl kcfa kcfc kcfl kcfo kckc kckf kckk kckl kcko kcla kclc kclf kclk kcll kcof kcol kfac kfal kfcf kfco kffa kfff kffk kfka kfla kflc kflf kfll kflo kfok kfoo kkaa kkac kkal kkck kkcl kkco kkkk kklc kklf kkll kklo kkoa kkol kkoo klaa klac klaf klak klal klca klcc klck klcl klfa klfc klff klka klkc klkk klkl klko klla kllc kllk kloa kloc klok klol kloo koac koak koal koca kocf kock kofa kofc koff kofk kofo koka kokc kokf kokk koko kola kolc kolf kolk koll kolo kooc kook kool kooo laaa laac laak laal laca lacc lack lacl laco lafc laff laka lala lall lalo lcac lcca lccc lcfc lfca lfcc lkal llao llcc lllc llll lloa lloc lloo loac loaf loca locc lock loco lofa loff loka lokk loko lola loll lolo looc loof look lool oafc oafo oall ocac ocak ocal occa occc ocfa oclc ofcl off- offa offc offo ofla okak okka okko okla oklo okok okol olac olaf olca olcc olfa olka olla ollo olof ooaa ooak ooff oola oolo oooo