quaif uqaif qauif aquif uaqif auqif quiaf uqiaf qiuaf iquaf uiqaf iuqaf qaiuf aqiuf qiauf iqauf aiquf iaquf uaiqf auiqf uiaqf iuaqf aiuqf iauqf quafi uqafi qaufi aqufi uaqfi auqfi qufai uqfai qfuai fquai ufqai fuqai qafui aqfui qfaui fqaui afqui faqui uafqi aufqi ufaqi fuaqi afuqi fauqi quifa uqifa qiufa iqufa uiqfa iuqfa qufia uqfia qfuia fquia ufqia fuqia qifua iqfua qfiua fqiua ifqua fiqua uifqa iufqa ufiqa fuiqa ifuqa fiuqa qaifu aqifu qiafu iqafu aiqfu iaqfu qafiu aqfiu qfaiu fqaiu afqiu faqiu qifau iqfau qfiau fqiau ifqau fiqau aifqu iafqu afiqu faiqu ifaqu fiaqu uaifq auifq uiafq iuafq aiufq iaufq uafiq aufiq ufaiq fuaiq afuiq fauiq uifaq iufaq ufiaq fuiaq ifuaq fiuaq aifuq iafuq afiuq faiuq ifauq fiauq
Note: these 'words' (valid or invalid) are all the permutations of the word quaif. These words are obtained by scrambling the letters in quaif.