signal isgnal sginal gsinal igsnal gisnal singal isngal snigal nsigal insgal nisgal sgnial gsnial sngial nsgial gnsial ngsial ignsal ginsal ingsal nigsal gnisal ngisal siganl isganl sgianl gsianl igsanl gisanl siagnl isagnl saignl asignl iasgnl aisgnl sgainl gsainl saginl asginl gasinl agsinl igasnl giasnl iagsnl aigsnl gaisnl agisnl sinagl isnagl sniagl nsiagl insagl nisagl siangl isangl saingl asingl iasngl aisngl snaigl nsaigl sanigl asnigl nasigl ansigl inasgl niasgl iansgl ainsgl naisgl anisgl sgnail gsnail sngail nsgail gnsail ngsail sganil gsanil sagnil asgnil gasnil agsnil snagil nsagil sangil asngil nasgil ansgil gnasil ngasil gansil agnsil nagsil angsil ignasl ginasl ingasl nigasl gniasl ngiasl igansl giansl iagnsl aignsl gainsl aginsl inagsl niagsl iangsl aingsl naigsl anigsl gnaisl ngaisl ganisl agnisl nagisl angisl signla isgnla sginla gsinla igsnla gisnla singla isngla snigla nsigla insgla nisgla sgnila gsnila sngila nsgila gnsila ngsila ignsla ginsla ingsla nigsla gnisla ngisla siglna isglna sgilna gsilna igslna gislna silgna islgna sligna lsigna ilsgna lisgna sglina gslina slgina lsgina glsina lgsina iglsna gilsna ilgsna ligsna glisna lgisna sinlga isnlga snilga nsilga inslga nislga silnga islnga slinga lsinga ilsnga lisnga snliga nsliga slniga lsniga nlsiga lnsiga inlsga nilsga ilnsga linsga nlisga lnisga sgnlia gsnlia snglia nsglia gnslia ngslia sglnia gslnia slgnia lsgnia glsnia lgsnia snlgia nslgia slngia lsngia nlsgia lnsgia gnlsia nglsia glnsia lgnsia nlgsia lngsia ignlsa ginlsa inglsa niglsa gnilsa ngilsa iglnsa gilnsa ilgnsa lignsa glinsa lginsa inlgsa nilgsa ilngsa lingsa nligsa lnigsa gnlisa nglisa glnisa lgnisa nlgisa lngisa sigaln isgaln sgialn gsialn igsaln gisaln siagln isagln saigln asigln iasgln aisgln sgailn gsailn sagiln asgiln gasiln agsiln igasln giasln iagsln aigsln gaisln agisln siglan isglan sgilan gsilan igslan gislan silgan islgan sligan lsigan ilsgan lisgan sglian gslian slgian lsgian glsian lgsian iglsan gilsan ilgsan ligsan glisan lgisan sialgn isalgn sailgn asilgn iaslgn aislgn silagn islagn sliagn lsiagn ilsagn lisagn salign aslign slaign lsaign alsign lasign ialsgn ailsgn ilasgn liasgn alisgn laisgn sgalin gsalin saglin asglin gaslin agslin sglain gslain slgain lsgain glsain lgsain salgin aslgin slagin lsagin alsgin lasgin galsin aglsin glasin lgasin algsin lagsin igalsn gialsn iaglsn aiglsn gailsn agilsn iglasn gilasn ilgasn ligasn gliasn lgiasn ialgsn ailgsn ilagsn liagsn aligsn laigsn galisn aglisn glaisn lgaisn algisn lagisn sinalg isnalg snialg nsialg insalg nisalg sianlg isanlg sainlg asinlg iasnlg aisnlg snailg nsailg sanilg asnilg nasilg ansilg inaslg niaslg ianslg ainslg naislg anislg sinlag isnlag snilag nsilag inslag nislag silnag islnag slinag lsinag ilsnag lisnag snliag nsliag slniag lsniag nlsiag lnsiag inlsag nilsag ilnsag linsag nlisag lnisag sialng isalng sailng asilng iaslng aislng silang islang sliang lsiang ilsang lisang saling asling slaing lsaing alsing lasing ialsng ailsng ilasng liasng alisng laisng snalig nsalig sanlig asnlig naslig anslig snlaig nslaig slnaig lsnaig nlsaig lnsaig salnig aslnig slanig lsanig alsnig lasnig nalsig anlsig nlasig lnasig alnsig lansig inalsg nialsg ianlsg ainlsg nailsg anilsg inlasg nilasg ilnasg linasg nliasg lniasg ialnsg ailnsg ilansg liansg alinsg lainsg nalisg anlisg nlaisg lnaisg alnisg lanisg sgnali gsnali sngali nsgali gnsali ngsali sganli gsanli sagnli asgnli gasnli agsnli snagli nsagli sangli asngli nasgli ansgli gnasli ngasli gansli agnsli nagsli angsli sgnlai gsnlai snglai nsglai gnslai ngslai sglnai gslnai slgnai lsgnai glsnai lgsnai snlgai nslgai slngai lsngai nlsgai lnsgai gnlsai nglsai glnsai lgnsai nlgsai lngsai sgalni gsalni saglni asglni gaslni agslni sglani gslani slgani lsgani glsani lgsani salgni aslgni slagni lsagni alsgni lasgni galsni aglsni glasni lgasni algsni lagsni snalgi nsalgi sanlgi asnlgi naslgi anslgi snlagi nslagi slnagi lsnagi nlsagi lnsagi salngi aslngi slangi lsangi alsngi lasngi nalsgi anlsgi nlasgi lnasgi alnsgi lansgi gnalsi ngalsi ganlsi agnlsi naglsi anglsi gnlasi nglasi glnasi lgnasi nlgasi lngasi galnsi aglnsi glansi lgansi algnsi lagnsi nalgsi anlgsi nlagsi lnagsi alngsi langsi ignals ginals ingals nigals gnials ngials iganls gianls iagnls aignls gainls aginls inagls niagls iangls aingls naigls anigls gnails ngails ganils agnils nagils angils ignlas ginlas inglas niglas gnilas ngilas iglnas gilnas ilgnas lignas glinas lginas inlgas nilgas ilngas lingas nligas lnigas gnlias nglias glnias lgnias nlgias lngias igalns gialns iaglns aiglns gailns agilns iglans gilans ilgans ligans glians lgians ialgns ailgns ilagns liagns aligns laigns galins aglins glains lgains algins lagins inalgs nialgs ianlgs ainlgs nailgs anilgs inlags nilags ilnags linags nliags lniags ialngs ailngs ilangs liangs alings laings naligs anligs nlaigs lnaigs alnigs lanigs gnalis ngalis ganlis agnlis naglis anglis gnlais nglais glnais lgnais nlgais lngais galnis aglnis glanis lganis algnis lagnis nalgis anlgis nlagis lnagis alngis langis
Note: these 'words' (valid or invalid) are all the permutations of the word signal. These words are obtained by scrambling the letters in signal.