nivdal invdal nvidal vnidal ivndal vindal nidval indval ndival dnival idnval dinval nvdial vndial ndvial dnvial vdnial dvnial ivdnal vidnal idvnal divnal vdinal dvinal nivadl invadl nviadl vniadl ivnadl vinadl niavdl inavdl naivdl anivdl ianvdl ainvdl nvaidl vnaidl navidl anvidl vanidl avnidl ivandl viandl iavndl aivndl vaindl avindl nidavl indavl ndiavl dniavl idnavl dinavl niadvl inadvl naidvl anidvl iandvl aindvl ndaivl dnaivl nadivl andivl danivl adnivl idanvl dianvl iadnvl aidnvl dainvl adinvl nvdail vndail ndvail dnvail vdnail dvnail nvadil vnadil navdil anvdil vandil avndil ndavil dnavil nadvil andvil danvil adnvil vdanil dvanil vadnil avdnil davnil advnil ivdanl vidanl idvanl divanl vdianl dvianl ivadnl viadnl iavdnl aivdnl vaidnl avidnl idavnl diavnl iadvnl aidvnl daivnl adivnl vdainl dvainl vadinl avdinl davinl advinl nivdla invdla nvidla vnidla ivndla vindla nidvla indvla ndivla dnivla idnvla dinvla nvdila vndila ndvila dnvila vdnila dvnila ivdnla vidnla idvnla divnla vdinla dvinla nivlda invlda nvilda vnilda ivnlda vinlda nilvda inlvda nlivda lnivda ilnvda linvda nvlida vnlida nlvida lnvida vlnida lvnida ivlnda vilnda ilvnda livnda vlinda lvinda nidlva indlva ndilva dnilva idnlva dinlva nildva inldva nlidva lnidva ilndva lindva ndliva dnliva nldiva lndiva dlniva ldniva idlnva dilnva ildnva lidnva dlinva ldinva nvdlia vndlia ndvlia dnvlia vdnlia dvnlia nvldia vnldia nlvdia lnvdia vlndia lvndia ndlvia dnlvia nldvia lndvia dlnvia ldnvia vdlnia dvlnia vldnia lvdnia dlvnia ldvnia ivdlna vidlna idvlna divlna vdilna dvilna ivldna vildna ilvdna livdna vlidna lvidna idlvna dilvna ildvna lidvna dlivna ldivna vdlina dvlina vldina lvdina dlvina ldvina nivald invald nviald vniald ivnald vinald niavld inavld naivld anivld ianvld ainvld nvaild vnaild navild anvild vanild avnild ivanld vianld iavnld aivnld vainld avinld nivlad invlad nvilad vnilad ivnlad vinlad nilvad inlvad nlivad lnivad ilnvad linvad nvliad vnliad nlviad lnviad vlniad lvniad ivlnad vilnad ilvnad livnad vlinad lvinad nialvd inalvd nailvd anilvd ianlvd ainlvd nilavd inlavd nliavd lniavd ilnavd linavd nalivd anlivd nlaivd lnaivd alnivd lanivd ialnvd ailnvd ilanvd lianvd alinvd lainvd nvalid vnalid navlid anvlid vanlid avnlid nvlaid vnlaid nlvaid lnvaid vlnaid lvnaid nalvid anlvid nlavid lnavid alnvid lanvid valnid avlnid vlanid lvanid alvnid lavnid ivalnd vialnd iavlnd aivlnd vailnd avilnd ivland viland ilvand livand vliand lviand ialvnd ailvnd ilavnd liavnd alivnd laivnd valind avlind vlaind lvaind alvind lavind nidalv indalv ndialv dnialv idnalv dinalv niadlv inadlv naidlv anidlv iandlv aindlv ndailv dnailv nadilv andilv danilv adnilv idanlv dianlv iadnlv aidnlv dainlv adinlv nidlav indlav ndilav dnilav idnlav dinlav nildav inldav nlidav lnidav ilndav lindav ndliav dnliav nldiav lndiav dlniav ldniav idlnav dilnav ildnav lidnav dlinav ldinav nialdv inaldv naildv anildv ianldv ainldv niladv inladv nliadv lniadv ilnadv linadv nalidv anlidv nlaidv lnaidv alnidv lanidv ialndv ailndv ilandv liandv alindv laindv ndaliv dnaliv nadliv andliv danliv adnliv ndlaiv dnlaiv nldaiv lndaiv dlnaiv ldnaiv naldiv anldiv nladiv lnadiv alndiv landiv dalniv adlniv dlaniv ldaniv aldniv ladniv idalnv dialnv iadlnv aidlnv dailnv adilnv idlanv dilanv ildanv lidanv dlianv ldianv ialdnv aildnv iladnv liadnv alidnv laidnv dalinv adlinv dlainv ldainv aldinv ladinv nvdali vndali ndvali dnvali vdnali dvnali nvadli vnadli navdli anvdli vandli avndli ndavli dnavli nadvli andvli danvli adnvli vdanli dvanli vadnli avdnli davnli advnli nvdlai vndlai ndvlai dnvlai vdnlai dvnlai nvldai vnldai nlvdai lnvdai vlndai lvndai ndlvai dnlvai nldvai lndvai dlnvai ldnvai vdlnai dvlnai vldnai lvdnai dlvnai ldvnai nvaldi vnaldi navldi anvldi vanldi avnldi nvladi vnladi nlvadi lnvadi vlnadi lvnadi nalvdi anlvdi nlavdi lnavdi alnvdi lanvdi valndi avlndi vlandi lvandi alvndi lavndi ndalvi dnalvi nadlvi andlvi danlvi adnlvi ndlavi dnlavi nldavi lndavi dlnavi ldnavi naldvi anldvi nladvi lnadvi alndvi landvi dalnvi adlnvi dlanvi ldanvi aldnvi ladnvi vdalni dvalni vadlni avdlni davlni advlni vdlani dvlani vldani lvdani dlvani ldvani valdni avldni vladni lvadni alvdni lavdni dalvni adlvni dlavni ldavni aldvni ladvni ivdaln vidaln idvaln divaln vdialn dvialn ivadln viadln iavdln aivdln vaidln avidln idavln diavln iadvln aidvln daivln adivln vdailn dvailn vadiln avdiln daviln adviln ivdlan vidlan idvlan divlan vdilan dvilan ivldan vildan ilvdan livdan vlidan lvidan idlvan dilvan ildvan lidvan dlivan ldivan vdlian dvlian vldian lvdian dlvian ldvian ivaldn vialdn iavldn aivldn vaildn avildn ivladn viladn ilvadn livadn vliadn lviadn ialvdn ailvdn ilavdn liavdn alivdn laivdn validn avlidn vlaidn lvaidn alvidn lavidn idalvn dialvn iadlvn aidlvn dailvn adilvn idlavn dilavn ildavn lidavn dliavn ldiavn ialdvn aildvn iladvn liadvn alidvn laidvn dalivn adlivn dlaivn ldaivn aldivn ladivn vdalin dvalin vadlin avdlin davlin advlin vdlain dvlain vldain lvdain dlvain ldvain valdin avldin vladin lvadin alvdin lavdin dalvin adlvin dlavin ldavin aldvin ladvin
Note: these 'words' (valid or invalid) are all the permutations of the word nivdal. These words are obtained by scrambling the letters in nivdal.