oftens fotens otfens tofens ftoens tfoens ofetns foetns oeftns eoftns feotns efotns otefns toefns oetfns eotfns teofns etofns fteons tfeons fetons eftons tefons etfons oftnes fotnes otfnes tofnes ftones tfones ofntes fontes onftes noftes fnotes nfotes otnfes tonfes ontfes notfes tnofes ntofes ftnoes tfnoes fntoes nftoes tnfoes ntfoes ofents foents oefnts eofnts feonts efonts ofnets fonets onfets nofets fnoets nfoets oenfts eonfts onefts noefts enofts neofts fenots efnots fneots nfeots enfots nefots otenfs toenfs oetnfs eotnfs teonfs etonfs otnefs tonefs ontefs notefs tnoefs ntoefs oentfs eontfs onetfs noetfs enotfs neotfs tenofs etnofs tneofs nteofs entofs netofs ftenos tfenos fetnos eftnos tefnos etfnos ftneos tfneos fnteos nfteos tnfeos ntfeos fentos efntos fnetos nfetos enftos neftos tenfos etnfos tnefos ntefos entfos netfos oftesn fotesn otfesn tofesn ftoesn tfoesn ofetsn foetsn oeftsn eoftsn feotsn efotsn otefsn toefsn oetfsn eotfsn teofsn etofsn fteosn tfeosn fetosn eftosn tefosn etfosn oftsen fotsen otfsen tofsen ftosen tfosen ofsten fosten osften soften fsoten sfoten otsfen tosfen ostfen sotfen tsofen stofen ftsoen tfsoen fstoen sftoen tsfoen stfoen ofestn foestn oefstn eofstn feostn efostn ofsetn fosetn osfetn sofetn fsoetn sfoetn oesftn eosftn oseftn soeftn esoftn seoftn fesotn efsotn fseotn sfeotn esfotn sefotn otesfn toesfn oetsfn eotsfn teosfn etosfn otsefn tosefn ostefn sotefn tsoefn stoefn oestfn eostfn osetfn soetfn esotfn seotfn tesofn etsofn tseofn steofn estofn setofn fteson tfeson fetson eftson tefson etfson ftseon tfseon fsteon sfteon tsfeon stfeon feston efston fseton sfeton esfton sefton tesfon etsfon tsefon stefon estfon setfon oftnse fotnse otfnse tofnse ftonse tfonse ofntse fontse onftse noftse fnotse nfotse otnfse tonfse ontfse notfse tnofse ntofse ftnose tfnose fntose nftose tnfose ntfose oftsne fotsne otfsne tofsne ftosne tfosne ofstne fostne osftne softne fsotne sfotne otsfne tosfne ostfne sotfne tsofne stofne ftsone tfsone fstone sftone tsfone stfone ofnste fonste onfste nofste fnoste nfoste ofsnte fosnte osfnte sofnte fsonte sfonte onsfte nosfte osnfte sonfte nsofte snofte fnsote nfsote fsnote sfnote nsfote snfote otnsfe tonsfe ontsfe notsfe tnosfe ntosfe otsnfe tosnfe ostnfe sotnfe tsonfe stonfe onstfe nostfe osntfe sontfe nsotfe snotfe tnsofe ntsofe tsnofe stnofe nstofe sntofe ftnsoe tfnsoe fntsoe nftsoe tnfsoe ntfsoe ftsnoe tfsnoe fstnoe sftnoe tsfnoe stfnoe fnstoe nfstoe fsntoe sfntoe nsftoe snftoe tnsfoe ntsfoe tsnfoe stnfoe nstfoe sntfoe ofenst foenst oefnst eofnst feonst efonst ofnest fonest onfest nofest fnoest nfoest oenfst eonfst onefst noefst enofst neofst fenost efnost fneost nfeost enfost nefost ofesnt foesnt oefsnt eofsnt feosnt efosnt ofsent fosent osfent sofent fsoent sfoent oesfnt eosfnt osefnt soefnt esofnt seofnt fesont efsont fseont sfeont esfont sefont ofnset fonset onfset nofset fnoset nfoset ofsnet fosnet osfnet sofnet fsonet sfonet onsfet nosfet osnfet sonfet nsofet snofet fnsoet nfsoet fsnoet sfnoet nsfoet snfoet oensft eonsft onesft noesft enosft neosft oesnft eosnft osenft soenft esonft seonft onseft noseft osneft soneft nsoeft snoeft ensoft nesoft esnoft senoft nseoft sneoft fensot efnsot fnesot nfesot enfsot nefsot fesnot efsnot fsenot sfenot esfnot sefnot fnseot nfseot fsneot sfneot nsfeot snfeot ensfot nesfot esnfot senfot nsefot snefot otensf toensf oetnsf eotnsf teonsf etonsf otnesf tonesf ontesf notesf tnoesf ntoesf oentsf eontsf onetsf noetsf enotsf neotsf tenosf etnosf tneosf nteosf entosf netosf otesnf toesnf oetsnf eotsnf teosnf etosnf otsenf tosenf ostenf sotenf tsoenf stoenf oestnf eostnf osetnf soetnf esotnf seotnf tesonf etsonf tseonf steonf estonf setonf otnsef tonsef ontsef notsef tnosef ntosef otsnef tosnef ostnef sotnef tsonef stonef onstef nostef osntef sontef nsotef snotef tnsoef ntsoef tsnoef stnoef nstoef sntoef oenstf eonstf onestf noestf enostf neostf oesntf eosntf osentf soentf esontf seontf onsetf nosetf osnetf sonetf nsoetf snoetf ensotf nesotf esnotf senotf nseotf sneotf tensof etnsof tnesof ntesof entsof netsof tesnof etsnof tsenof stenof estnof setnof tnseof ntseof tsneof stneof nsteof snteof enstof nestof esntof sentof nsetof snetof ftenso tfenso fetnso eftnso tefnso etfnso ftneso tfneso fnteso nfteso tnfeso ntfeso fentso efntso fnetso nfetso enftso neftso tenfso etnfso tnefso ntefso entfso netfso ftesno tfesno fetsno eftsno tefsno etfsno ftseno tfseno fsteno sfteno tsfeno stfeno festno efstno fsetno sfetno esftno seftno tesfno etsfno tsefno stefno estfno setfno ftnseo tfnseo fntseo nftseo tnfseo ntfseo ftsneo tfsneo fstneo sftneo tsfneo stfneo fnsteo nfsteo fsnteo sfnteo nsfteo snfteo tnsfeo ntsfeo tsnfeo stnfeo nstfeo sntfeo fensto efnsto fnesto nfesto enfsto nefsto fesnto efsnto fsento sfento esfnto sefnto fnseto nfseto fsneto sfneto nsfeto snfeto ensfto nesfto esnfto senfto nsefto snefto tensfo etnsfo tnesfo ntesfo entsfo netsfo tesnfo etsnfo tsenfo stenfo estnfo setnfo tnsefo ntsefo tsnefo stnefo nstefo sntefo enstfo nestfo esntfo sentfo nsetfo snetfo
Note: these 'words' (valid or invalid) are all the permutations of the word oftens. These words are obtained by scrambling the letters in oftens.