retch ertch rtech trech etrch terch recth ercth rceth creth ecrth certh rtceh trceh rcteh crteh tcreh ctreh etcrh tecrh ectrh cetrh tcerh cterh rethc erthc rtehc trehc etrhc terhc rehtc erhtc rhetc hretc ehrtc hertc rthec trhec rhtec hrtec threc htrec ethrc tehrc ehtrc hetrc therc hterc recht ercht rceht creht ecrht cerht rehct erhct rhect hrect ehrct herct rchet crhet rhcet hrcet chret hcret echrt cehrt ehcrt hecrt chert hcert rtche trche rcthe crthe tcrhe ctrhe rthce trhce rhtce hrtce thrce htrce rchte crhte rhcte hrcte chrte hcrte tchre cthre thcre htcre chtre hctre etchr techr ecthr cethr tcehr ctehr ethcr tehcr ehtcr hetcr thecr htecr echtr cehtr ehctr hectr chetr hcetr tcher cther thcer htcer chter hcter
Note: these 'words' (valid or invalid) are all the permutations of the word retch. These words are obtained by scrambling the letters in retch.