thowl htowl tohwl othwl hotwl ohtwl thwol htwol twhol wthol hwtol whtol towhl otwhl twohl wtohl owthl wothl howtl ohwtl hwotl whotl owhtl wohtl tholw htolw tohlw othlw hotlw ohtlw thlow htlow tlhow lthow hltow lhtow tolhw otlhw tlohw ltohw olthw lothw holtw ohltw hlotw lhotw olhtw lohtw thwlo htwlo twhlo wthlo hwtlo whtlo thlwo htlwo tlhwo lthwo hltwo lhtwo twlho wtlho tlwho ltwho wltho lwtho hwlto whlto hlwto lhwto wlhto lwhto towlh otwlh twolh wtolh owtlh wotlh tolwh otlwh tlowh ltowh oltwh lotwh twloh wtloh tlwoh ltwoh wltoh lwtoh owlth wolth olwth lowth wloth lwoth howlt ohwlt hwolt wholt owhlt wohlt holwt ohlwt hlowt lhowt olhwt lohwt hwlot whlot hlwot lhwot wlhot lwhot owlht wolht olwht lowht wloht lwoht
Note: these 'words' (valid or invalid) are all the permutations of the word thowl. These words are obtained by scrambling the letters in thowl.