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