lings ilngs lnigs nligs inlgs nilgs ligns ilgns lgins glins iglns gilns lngis nlgis lgnis glnis nglis gnlis ingls nigls ignls ginls ngils gnils linsg ilnsg lnisg nlisg inlsg nilsg lisng ilsng lsing sling islng silng lnsig nlsig lsnig slnig nslig snlig inslg nislg isnlg sinlg nsilg snilg ligsn ilgsn lgisn glisn iglsn gilsn lisgn ilsgn lsign slign islgn silgn lgsin glsin lsgin slgin gslin sglin igsln gisln isgln sigln gsiln sgiln lngsi nlgsi lgnsi glnsi nglsi gnlsi lnsgi nlsgi lsngi slngi nslgi snlgi lgsni glsni lsgni slgni gslni sglni ngsli gnsli nsgli sngli gsnli sgnli ingsl nigsl ignsl ginsl ngisl gnisl insgl nisgl isngl singl nsigl snigl igsnl gisnl isgnl signl gsinl sginl ngsil gnsil nsgil sngil gsnil sgnil
Note: these 'words' (valid or invalid) are all the permutations of the word lings. These words are obtained by scrambling the letters in lings.