strop tsrop srtop rstop trsop rtsop storp tsorp sotrp ostrp tosrp otsrp srotp rsotp sortp osrtp rostp orstp trosp rtosp torsp otrsp rotsp ortsp strpo tsrpo srtpo rstpo trspo rtspo stpro tspro sptro pstro tpsro ptsro srpto rspto sprto psrto rpsto prsto trpso rtpso tprso ptrso rptso prtso stopr tsopr sotpr ostpr tospr otspr stpor tspor sptor pstor tpsor ptsor soptr osptr spotr psotr opstr postr topsr otpsr tposr ptosr optsr potsr sropt rsopt sorpt osrpt rospt orspt srpot rspot sprot psrot rpsot prsot soprt osprt sport psort opsrt posrt ropst orpst rpost prost oprst porst trops rtops torps otrps rotps ortps trpos rtpos tpros ptros rptos prtos toprs otprs tpors ptors optrs potrs ropts orpts rpots prots oprts ports
Note: these 'words' (valid or invalid) are all the permutations of the word strop. These words are obtained by scrambling the letters in strop.