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