postop opstop psotop spotop osptop soptop potsop optsop ptosop tposop otpsop topsop pstoop sptoop ptsoop tpsoop stpoop tspoop ostpop sotpop otspop tospop stopop tsopop posotp opsotp psootp spootp ospotp sopotp poostp opostp poostp opostp oopstp oopstp psootp spootp posotp opsotp sopotp ospotp osoptp sooptp oosptp oosptp sooptp osoptp potosp optosp ptoosp tpoosp otposp toposp pootsp opotsp pootsp opotsp ooptsp ooptsp ptoosp tpoosp potosp optosp toposp otposp otopsp toopsp ootpsp ootpsp toopsp otopsp pstoop sptoop ptsoop tpsoop stpoop tspoop psotop spotop postop opstop soptop osptop ptosop tposop potsop optsop topsop otpsop stopop tsopop sotpop ostpop tospop otspop ostopp sotopp otsopp tosopp stoopp tsoopp osotpp sootpp oostpp oostpp sootpp osotpp otospp toospp ootspp ootspp toospp otospp stoopp tsoopp sotopp ostopp tosopp otsopp postpo opstpo psotpo spotpo osptpo soptpo potspo optspo ptospo tpospo otpspo topspo pstopo sptopo ptsopo tpsopo stpopo tspopo ostppo sotppo otsppo tosppo stoppo tsoppo pospto opspto psopto spopto osppto soppto popsto oppsto pposto pposto oppsto popsto pspoto sppoto ppsoto ppsoto sppoto pspoto osppto soppto opspto pospto spopto psopto potpso optpso ptopso tpopso otppso toppso poptso opptso ppotso ppotso opptso poptso ptposo tpposo pptoso pptoso tpposo ptposo otppso toppso optpso potpso tpopso ptopso pstpoo sptpoo ptspoo tpspoo stppoo tsppoo psptoo spptoo ppstoo ppstoo spptoo psptoo ptpsoo tppsoo pptsoo pptsoo tppsoo ptpsoo stppoo tsppoo sptpoo pstpoo tpspoo ptspoo ostppo sotppo otsppo tosppo stoppo tsoppo osptpo soptpo opstpo postpo spotpo psotpo otpspo topspo optspo potspo tpospo ptospo stpopo tspopo sptopo pstopo tpsopo ptsopo posopt opsopt psoopt spoopt ospopt sopopt poospt opospt poospt opospt oopspt oopspt psoopt spoopt posopt opsopt sopopt ospopt osoppt sooppt oosppt oosppt sooppt osoppt pospot opspot psopot spopot osppot soppot popsot oppsot pposot pposot oppsot popsot pspoot sppoot ppsoot ppsoot sppoot pspoot osppot soppot opspot pospot spopot psopot poopst opopst poopst opopst ooppst ooppst popost oppost ppoost ppoost oppost popost popost oppost ppoost ppoost oppost popost ooppst ooppst opopst poopst opopst poopst psopot spopot pospot opspot soppot osppot pspoot sppoot ppsoot ppsoot sppoot pspoot popsot oppsot pposot pposot oppsot popsot soppot osppot spopot psopot opspot pospot osoppt sooppt oosppt oosppt sooppt osoppt ospopt sopopt opsopt posopt spoopt psoopt oopspt oopspt opospt poospt opospt poospt sopopt ospopt spoopt psoopt opsopt posopt potops optops ptoops tpoops otpops topops pootps opotps pootps opotps ooptps ooptps ptoops tpoops potops optops topops otpops otopps toopps ootpps ootpps toopps otopps potpos optpos ptopos tpopos otppos toppos poptos opptos ppotos ppotos opptos poptos ptpoos tppoos pptoos pptoos tppoos ptpoos otppos toppos optpos potpos tpopos ptopos poopts opopts poopts opopts ooppts ooppts popots oppots ppoots ppoots oppots popots popots oppots ppoots ppoots oppots popots ooppts ooppts opopts poopts opopts poopts ptopos tpopos potpos optpos toppos otppos ptpoos tppoos pptoos pptoos tppoos ptpoos poptos opptos ppotos ppotos opptos poptos toppos otppos tpopos ptopos optpos potpos otopps toopps ootpps ootpps toopps otopps otpops topops optops potops tpoops ptoops ooptps ooptps opotps pootps opotps pootps topops otpops tpoops ptoops optops potops pstopo sptopo ptsopo tpsopo stpopo tspopo psotpo spotpo postpo opstpo soptpo osptpo ptospo tpospo potspo optspo topspo otpspo stoppo tsoppo sotppo ostppo tosppo otsppo pstpoo sptpoo ptspoo tpspoo stppoo tsppoo psptoo spptoo ppstoo ppstoo spptoo psptoo ptpsoo tppsoo pptsoo pptsoo tppsoo ptpsoo stppoo tsppoo sptpoo pstpoo tpspoo ptspoo psopto spopto pospto opspto soppto osppto pspoto sppoto ppsoto ppsoto sppoto pspoto popsto oppsto pposto pposto oppsto popsto soppto osppto spopto psopto opspto pospto ptopso tpopso potpso optpso toppso otppso ptposo tpposo pptoso pptoso tpposo ptposo poptso opptso ppotso ppotso opptso poptso toppso otppso tpopso ptopso optpso potpso stoppo tsoppo sotppo ostppo tosppo otsppo stpopo tspopo sptopo pstopo tpsopo ptsopo soptpo osptpo spotpo psotpo opstpo postpo topspo otpspo tpospo ptospo optspo potspo ostopp sotopp otsopp tosopp stoopp tsoopp osotpp sootpp oostpp oostpp sootpp osotpp otospp toospp ootspp ootspp toospp otospp stoopp tsoopp sotopp ostopp tosopp otsopp ostpop sotpop otspop tospop stopop tsopop osptop soptop opstop postop spotop psotop otpsop topsop optsop potsop tposop ptosop stpoop tspoop sptoop pstoop tpsoop ptsoop osoptp sooptp oosptp oosptp sooptp osoptp ospotp sopotp opsotp posotp spootp psootp oopstp oopstp opostp poostp opostp poostp sopotp ospotp spootp psootp opsotp posotp otopsp toopsp ootpsp ootpsp toopsp otopsp otposp toposp optosp potosp tpoosp ptoosp ooptsp ooptsp opotsp pootsp opotsp pootsp toposp otposp tpoosp ptoosp optosp potosp stopop tsopop sotpop ostpop tospop otspop stpoop tspoop sptoop pstoop tpsoop ptsoop soptop osptop spotop psotop opstop postop topsop otpsop tposop ptosop optsop potsop
Note: these 'words' (valid or invalid) are all the permutations of the word postop. These words are obtained by scrambling the letters in postop.