quids uqids qiuds iquds uiqds iuqds qudis uqdis qduis dquis udqis duqis qidus iqdus qdius dqius idqus diqus uidqs iudqs udiqs duiqs iduqs diuqs quisd uqisd qiusd iqusd uiqsd iuqsd qusid uqsid qsuid squid usqid suqid qisud iqsud qsiud sqiud isqud siqud uisqd iusqd usiqd suiqd isuqd siuqd qudsi uqdsi qdusi dqusi udqsi duqsi qusdi uqsdi qsudi squdi usqdi suqdi qdsui dqsui qsdui sqdui dsqui sdqui udsqi dusqi usdqi sudqi dsuqi sduqi qidsu iqdsu qdisu dqisu idqsu diqsu qisdu iqsdu qsidu sqidu isqdu siqdu qdsiu dqsiu qsdiu sqdiu dsqiu sdqiu idsqu disqu isdqu sidqu dsiqu sdiqu uidsq iudsq udisq duisq idusq diusq uisdq iusdq usidq suidq isudq siudq udsiq dusiq usdiq sudiq dsuiq sduiq idsuq disuq isduq siduq dsiuq sdiuq
Note: these 'words' (valid or invalid) are all the permutations of the word quids. These words are obtained by scrambling the letters in quids.