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