nipgl inpgl npigl pnigl ipngl pingl nigpl ingpl ngipl gnipl ignpl ginpl npgil pngil ngpil gnpil pgnil gpnil ipgnl pignl igpnl gipnl pginl gpinl niplg inplg npilg pnilg ipnlg pinlg nilpg inlpg nlipg lnipg ilnpg linpg nplig pnlig nlpig lnpig plnig lpnig iplng pilng ilpng lipng pling lping niglp inglp ngilp gnilp ignlp ginlp nilgp inlgp nligp lnigp ilngp lingp nglip gnlip nlgip lngip glnip lgnip iglnp gilnp ilgnp lignp glinp lginp npgli pngli ngpli gnpli pgnli gpnli nplgi pnlgi nlpgi lnpgi plngi lpngi nglpi gnlpi nlgpi lngpi glnpi lgnpi pglni gplni plgni lpgni glpni lgpni ipgln pigln igpln gipln pgiln gpiln iplgn pilgn ilpgn lipgn plign lpign iglpn gilpn ilgpn ligpn glipn lgipn pglin gplin plgin lpgin glpin lgpin
Note: these 'words' (valid or invalid) are all the permutations of the word nipgl. These words are obtained by scrambling the letters in nipgl.