pingo ipngo pnigo npigo inpgo nipgo pigno ipgno pgino gpino igpno gipno pngio npgio pgnio gpnio ngpio gnpio ingpo nigpo ignpo ginpo ngipo gnipo pinog ipnog pniog npiog inpog nipog piong ipong poing oping iopng oipng pnoig npoig ponig opnig nopig onpig inopg niopg ionpg oinpg noipg onipg pigon ipgon pgion gpion igpon gipon piogn ipogn poign opign iopgn oipgn pgoin gpoin pogin opgin gopin ogpin igopn giopn iogpn oigpn goipn ogipn pngoi npgoi pgnoi gpnoi ngpoi gnpoi pnogi npogi pongi opngi nopgi onpgi pgoni gponi pogni opgni gopni ogpni ngopi gnopi nogpi ongpi gonpi ognpi ingop nigop ignop ginop ngiop gniop inogp niogp iongp oingp noigp onigp igonp gionp iognp oignp goinp oginp ngoip gnoip nogip ongip gonip ognip
Note: these 'words' (valid or invalid) are all the permutations of the word pingo. These words are obtained by scrambling the letters in pingo.