flunks lfunks fulnks uflnks lufnks ulfnks flnuks lfnuks fnluks nfluks lnfuks nlfuks funlks ufnlks fnulks nfulks unflks nuflks lunfks ulnfks lnufks nlufks unlfks nulfks flukns lfukns fulkns uflkns lufkns ulfkns flkuns lfkuns fkluns kfluns lkfuns klfuns fuklns ufklns fkulns kfulns ukflns kuflns lukfns ulkfns lkufns klufns uklfns kulfns flnkus lfnkus fnlkus nflkus lnfkus nlfkus flknus lfknus fklnus kflnus lkfnus klfnus fnklus nfklus fknlus kfnlus nkflus knflus lnkfus nlkfus lknfus klnfus nklfus knlfus funkls ufnkls fnukls nfukls unfkls nufkls fuknls ufknls fkunls kfunls ukfnls kufnls fnkuls nfkuls fknuls kfnuls nkfuls knfuls unkfls nukfls uknfls kunfls nkufls knufls lunkfs ulnkfs lnukfs nlukfs unlkfs nulkfs luknfs ulknfs lkunfs klunfs uklnfs kulnfs lnkufs nlkufs lknufs klnufs nklufs knlufs unklfs nuklfs uknlfs kunlfs nkulfs knulfs flunsk lfunsk fulnsk uflnsk lufnsk ulfnsk flnusk lfnusk fnlusk nflusk lnfusk nlfusk funlsk ufnlsk fnulsk nfulsk unflsk nuflsk lunfsk ulnfsk lnufsk nlufsk unlfsk nulfsk flusnk lfusnk fulsnk uflsnk lufsnk ulfsnk flsunk lfsunk fslunk sflunk lsfunk slfunk fuslnk ufslnk fsulnk sfulnk usflnk suflnk lusfnk ulsfnk lsufnk slufnk uslfnk sulfnk flnsuk lfnsuk fnlsuk nflsuk lnfsuk nlfsuk flsnuk lfsnuk fslnuk sflnuk lsfnuk slfnuk fnsluk nfsluk fsnluk sfnluk nsfluk snfluk lnsfuk nlsfuk lsnfuk slnfuk nslfuk snlfuk funslk ufnslk fnuslk nfuslk unfslk nufslk fusnlk ufsnlk fsunlk sfunlk usfnlk sufnlk fnsulk nfsulk fsnulk sfnulk nsfulk snfulk unsflk nusflk usnflk sunflk nsuflk snuflk lunsfk ulnsfk lnusfk nlusfk unlsfk nulsfk lusnfk ulsnfk lsunfk slunfk uslnfk sulnfk lnsufk nlsufk lsnufk slnufk nslufk snlufk unslfk nuslfk usnlfk sunlfk nsulfk snulfk fluksn lfuksn fulksn uflksn lufksn ulfksn flkusn lfkusn fklusn kflusn lkfusn klfusn fuklsn ufklsn fkulsn kfulsn ukflsn kuflsn lukfsn ulkfsn lkufsn klufsn uklfsn kulfsn fluskn lfuskn fulskn uflskn lufskn ulfskn flsukn lfsukn fslukn sflukn lsfukn slfukn fuslkn ufslkn fsulkn sfulkn usflkn suflkn lusfkn ulsfkn lsufkn slufkn uslfkn sulfkn flksun lfksun fklsun kflsun lkfsun klfsun flskun lfskun fslkun sflkun lsfkun slfkun fkslun kfslun fsklun sfklun ksflun skflun lksfun klsfun lskfun slkfun kslfun sklfun fuksln ufksln fkusln kfusln ukfsln kufsln fuskln ufskln fsukln sfukln usfkln sufkln fksuln kfsuln fskuln sfkuln ksfuln skfuln uksfln kusfln uskfln sukfln ksufln skufln luksfn ulksfn lkusfn klusfn uklsfn kulsfn luskfn ulskfn lsukfn slukfn uslkfn sulkfn lksufn klsufn lskufn slkufn kslufn sklufn ukslfn kuslfn usklfn suklfn ksulfn skulfn flnksu lfnksu fnlksu nflksu lnfksu nlfksu flknsu lfknsu fklnsu kflnsu lkfnsu klfnsu fnklsu nfklsu fknlsu kfnlsu nkflsu knflsu lnkfsu nlkfsu lknfsu klnfsu nklfsu knlfsu flnsku lfnsku fnlsku nflsku lnfsku nlfsku flsnku lfsnku fslnku sflnku lsfnku slfnku fnslku nfslku fsnlku sfnlku nsflku snflku lnsfku nlsfku lsnfku slnfku nslfku snlfku flksnu lfksnu fklsnu kflsnu lkfsnu klfsnu flsknu lfsknu fslknu sflknu lsfknu slfknu fkslnu kfslnu fsklnu sfklnu ksflnu skflnu lksfnu klsfnu lskfnu slkfnu kslfnu sklfnu fnkslu nfkslu fknslu kfnslu nkfslu knfslu fnsklu nfsklu fsnklu sfnklu nsfklu snfklu fksnlu kfsnlu fsknlu sfknlu ksfnlu skfnlu nksflu knsflu nskflu snkflu ksnflu sknflu lnksfu nlksfu lknsfu klnsfu nklsfu knlsfu lnskfu nlskfu lsnkfu slnkfu nslkfu snlkfu lksnfu klsnfu lsknfu slknfu kslnfu sklnfu nkslfu knslfu nsklfu snklfu ksnlfu sknlfu funksl ufnksl fnuksl nfuksl unfksl nufksl fuknsl ufknsl fkunsl kfunsl ukfnsl kufnsl fnkusl nfkusl fknusl kfnusl nkfusl knfusl unkfsl nukfsl uknfsl kunfsl nkufsl knufsl funskl ufnskl fnuskl nfuskl unfskl nufskl fusnkl ufsnkl fsunkl sfunkl usfnkl sufnkl fnsukl nfsukl fsnukl sfnukl nsfukl snfukl unsfkl nusfkl usnfkl sunfkl nsufkl snufkl fuksnl ufksnl fkusnl kfusnl ukfsnl kufsnl fusknl ufsknl fsuknl sfuknl usfknl sufknl fksunl kfsunl fskunl sfkunl ksfunl skfunl uksfnl kusfnl uskfnl sukfnl ksufnl skufnl fnksul nfksul fknsul kfnsul nkfsul knfsul fnskul nfskul fsnkul sfnkul nsfkul snfkul fksnul kfsnul fsknul sfknul ksfnul skfnul nksful knsful nskful snkful ksnful sknful unksfl nuksfl uknsfl kunsfl nkusfl knusfl unskfl nuskfl usnkfl sunkfl nsukfl snukfl uksnfl kusnfl usknfl suknfl ksunfl skunfl nksufl knsufl nskufl snkufl ksnufl sknufl lunksf ulnksf lnuksf nluksf unlksf nulksf luknsf ulknsf lkunsf klunsf uklnsf kulnsf lnkusf nlkusf lknusf klnusf nklusf knlusf unklsf nuklsf uknlsf kunlsf nkulsf knulsf lunskf ulnskf lnuskf nluskf unlskf nulskf lusnkf ulsnkf lsunkf slunkf uslnkf sulnkf lnsukf nlsukf lsnukf slnukf nslukf snlukf unslkf nuslkf usnlkf sunlkf nsulkf snulkf luksnf ulksnf lkusnf klusnf uklsnf kulsnf lusknf ulsknf lsuknf sluknf uslknf sulknf lksunf klsunf lskunf slkunf kslunf sklunf ukslnf kuslnf usklnf suklnf ksulnf skulnf lnksuf nlksuf lknsuf klnsuf nklsuf knlsuf lnskuf nlskuf lsnkuf slnkuf nslkuf snlkuf lksnuf klsnuf lsknuf slknuf kslnuf sklnuf nksluf knsluf nskluf snkluf ksnluf sknluf unkslf nukslf uknslf kunslf nkuslf knuslf unsklf nusklf usnklf sunklf nsuklf snuklf uksnlf kusnlf usknlf suknlf ksunlf skunlf nksulf knsulf nskulf snkulf ksnulf sknulf
Note: these 'words' (valid or invalid) are all the permutations of the word flunks. These words are obtained by scrambling the letters in flunks.