prats rpats parts aprts rapts arpts prtas rptas ptras tpras rtpas trpas patrs aptrs ptars tpars atprs taprs ratps artps rtaps traps atrps tarps prast rpast parst aprst rapst arpst prsat rpsat psrat sprat rspat srpat pasrt apsrt psart spart asprt saprt raspt arspt rsapt srapt asrpt sarpt prtsa rptsa ptrsa tprsa rtpsa trpsa prsta rpsta psrta sprta rspta srpta ptsra tpsra pstra sptra tspra stpra rtspa trspa rstpa srtpa tsrpa strpa patsr aptsr ptasr tpasr atpsr tapsr pastr apstr psatr spatr asptr saptr ptsar tpsar pstar sptar tspar stpar atspr taspr astpr satpr tsapr stapr ratsp artsp rtasp trasp atrsp tarsp rastp arstp rsatp sratp asrtp sartp rtsap trsap rstap srtap tsrap strap atsrp tasrp astrp satrp tsarp starp
Note: these 'words' (valid or invalid) are all the permutations of the word prats. These words are obtained by scrambling the letters in prats.