thesp htesp tehsp ethsp hetsp ehtsp thsep htsep tshep sthep hstep shtep teshp etshp tsehp stehp esthp sethp hestp ehstp hsetp shetp eshtp sehtp theps hteps tehps ethps hetps ehtps thpes htpes tphes pthes hptes phtes tephs etphs tpehs ptehs epths peths hepts ehpts hpets phets ephts pehts thspe htspe tshpe sthpe hstpe shtpe thpse htpse tphse pthse hptse phtse tsphe stphe tpshe ptshe spthe psthe hspte shpte hpste phste sphte pshte tesph etsph tseph steph estph setph tepsh etpsh tpesh ptesh eptsh petsh tspeh stpeh tpseh ptseh spteh psteh espth septh epsth pesth speth pseth hespt ehspt hsept shept eshpt sehpt hepst ehpst hpest phest ephst pehst hspet shpet hpset phset sphet pshet espht sepht epsht pesht speht pseht
Note: these 'words' (valid or invalid) are all the permutations of the word thesp. These words are obtained by scrambling the letters in thesp.