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