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