twigs wtigs tiwgs itwgs witgs iwtgs twgis wtgis tgwis gtwis wgtis gwtis tigws itgws tgiws gtiws igtws gitws wigts iwgts wgits gwits igwts giwts twisg wtisg tiwsg itwsg witsg iwtsg twsig wtsig tswig stwig wstig swtig tiswg itswg tsiwg stiwg istwg sitwg wistg iwstg wsitg switg iswtg siwtg twgsi wtgsi tgwsi gtwsi wgtsi gwtsi twsgi wtsgi tswgi stwgi wstgi swtgi tgswi gtswi tsgwi stgwi gstwi sgtwi wgsti gwsti wsgti swgti gswti sgwti tigsw itgsw tgisw gtisw igtsw gitsw tisgw itsgw tsigw stigw istgw sitgw tgsiw gtsiw tsgiw stgiw gstiw sgtiw igstw gistw isgtw sigtw gsitw sgitw wigst iwgst wgist gwist igwst giwst wisgt iwsgt wsigt swigt iswgt siwgt wgsit gwsit wsgit swgit gswit sgwit igswt giswt isgwt sigwt gsiwt sgiwt
Note: these 'words' (valid or invalid) are all the permutations of the word twigs. These words are obtained by scrambling the letters in twigs.