cccc cccf cccl cccu ccfc ccff ccfl cclc ccoc ccrc ccrf ccrl ccuc cfcf cfcl cfco cffr cfor ckck ckcl ckco ckfr cklf ckoc ckoo ckor ckrc clof clok cloo clor clou clro cock coco cocu cofc coff cok- coko col- colk coll colo colu coof cook cool cor- corc corf cork corl coro corr couk coul cour crcc crcr crfc crfl crkc crkl crlf croc crok crol croo cror cruk cucc cuck cufc cuff cufo cuk- culc culk cull culo curf curl curo curr f--k fccf fcuk ffcc ffff ffrr flcl floc flok floo flor flou fluf fluo flur fock foco fofo folc folk foll folo folr foof fook fool for- fork forl foro forr foul four frcc frfc frol frou fuc- fuck fufc fuff fufu fukk fuko fuku fulk full fulu fuor fur- furl furo furr k-lo kccc kcck kccl kccr kccu kcfc kcfl kcfo kckc kckf kckk kckl kcko kckr kclc kclf kclk kcll kclr kclu kcof kcol kcor kcou kcrc kcro kcrr kcru kcuf kcuk kcul kfcf kfco kfcr kfff kffk kflc kflf kfll kflo kfok kfoo kfor kfrc kfro kfrr kfru kful kfuo kkck kkcl kkco kkcr kkfr kkkk kklc kklf kkll kklo kkol kkoo kkor kkrc kkrf kkrk kkrl kkro kkrr kkuu klcc klck klcl klcr klfc klff klkc klkk klkl klko klkr kllc kllk kloc klok klol kloo klor klou klrc klrf klrk klrr klru kluf kluk klur kluu kocf kock kofc koff kofk kofo kofu kokc kokf kokk koko kokr koku kolc kolf kolk koll kolo kolr kolu kooc kook kool kooo koor koou korc korf kork korl koro korr koru koul kour kouu krcc krcl krco krcu krfc krff krfo krkc krkk krko krkr krku krlc krlf kroc krof krok krol kroo kror krrc krrf krrk krrl krro krrr kruc kruf kruk krul krur kucc kuco kucr kufc kuff kufo kufr kukk kukl kuku kulf kull kulo kulu kuok kuol kuoo kurk kurl kuro kurr kuru kuuk kuul kuur kuuu lccc lcfc lcfr lcor lcrl lfcc llcc lllc llll lloc lloo locc lock loco locu loff lokk loko loll lolo looc loof look lool loor lork loro louk loul lour louu lrfc lroc lrrc lrrr luck luff lufu luko lull lulu lurk luuk occc oclc ocrl ocro ocrr ocul ocur ofcl ofcr off- offc offo offr offu ofor okcu okko oklo okok okol okor okro okul okur olcc ollo olof olor olur oocr ooff ooku oolo oooo orco orff orfu orko orlo orlu oro- orof orok oror orro oucc oufc ouff oulk oulu our- ouro ouu- rccc rcfc rffc rffl rkkf rocc rock roco rofc roff rofl rofo rokk roko rokr roku rolf rolk roll rolo roof rook rool roor rorc rork roro roru rouf rouk roul rrfc rrrr ruck rufc ruff rufo rukk ruku rulk rull rulo ruok rurc ruro ruru ucrc ufcu ufuk ukcc ukko ukok ukrc ukur ulcc ulco ullo ullr ulo- uloc uluk ulul uocc uofl uofo uolc uor- urff uro- urok urol uroo uruk urur uulu uuoc uuuu