thols htols tohls othls hotls ohtls thlos htlos tlhos lthos hltos lhtos tolhs otlhs tlohs ltohs olths loths holts ohlts hlots lhots olhts lohts thosl htosl tohsl othsl hotsl ohtsl thsol htsol tshol sthol hstol shtol toshl otshl tsohl stohl osthl sothl hostl ohstl hsotl shotl oshtl sohtl thlso htlso tlhso lthso hltso lhtso thslo htslo tshlo sthlo hstlo shtlo tlsho ltsho tslho stlho lstho sltho hlsto lhsto hslto shlto lshto slhto tolsh otlsh tlosh ltosh oltsh lotsh toslh otslh tsolh stolh ostlh sotlh tlsoh ltsoh tsloh stloh lstoh sltoh olsth losth oslth solth lsoth sloth holst ohlst hlost lhost olhst lohst hoslt ohslt hsolt sholt oshlt sohlt hlsot lhsot hslot shlot lshot slhot olsht losht oslht solht lsoht sloht
Note: these 'words' (valid or invalid) are all the permutations of the word thols. These words are obtained by scrambling the letters in thols.