rostra orstra rsotra srotra osrtra sortra rotsra ortsra rtosra trosra otrsra torsra rstora srtora rtsora trsora strora tsrora ostrra sotrra otsrra tosrra storra tsorra rosrta orsrta rsorta srorta osrrta sorrta rorsta orrsta rrosta rrosta orrsta rorsta rsrota srrota rrsota rrsota srrota rsrota osrrta sorrta orsrta rosrta srorta rsorta rotrsa ortrsa rtorsa trorsa otrrsa torrsa rortsa orrtsa rrotsa rrotsa orrtsa rortsa rtrosa trrosa rrtosa rrtosa trrosa rtrosa otrrsa torrsa ortrsa rotrsa trorsa rtorsa rstroa srtroa rtsroa trsroa strroa tsrroa rsrtoa srrtoa rrstoa rrstoa srrtoa rsrtoa rtrsoa trrsoa rrtsoa rrtsoa trrsoa rtrsoa strroa tsrroa srtroa rstroa trsroa rtsroa ostrra sotrra otsrra tosrra storra tsorra osrtra sortra orstra rostra srotra rsotra otrsra torsra ortsra rotsra trosra rtosra strora tsrora srtora rstora trsora rtsora rostar orstar rsotar srotar osrtar sortar rotsar ortsar rtosar trosar otrsar torsar rstoar srtoar rtsoar trsoar stroar tsroar ostrar sotrar otsrar tosrar storar tsorar rosatr orsatr rsoatr sroatr osratr soratr roastr orastr raostr arostr oarstr aorstr rsaotr sraotr rasotr arsotr sarotr asrotr osartr soartr oasrtr aosrtr saortr asortr rotasr ortasr rtoasr troasr otrasr torasr roatsr oratsr raotsr arotsr oartsr aortsr rtaosr traosr ratosr artosr tarosr atrosr otarsr toarsr oatrsr aotrsr taorsr atorsr rstaor srtaor rtsaor trsaor straor tsraor rsator srator rastor arstor sartor asrtor rtasor trasor ratsor artsor tarsor atrsor staror tsaror satror astror tasror atsror ostarr sotarr otsarr tosarr stoarr tsoarr osatrr soatrr oastrr aostrr saotrr asotrr otasrr toasrr oatsrr aotsrr taosrr atosrr staorr tsaorr satorr astorr tasorr atsorr rosrat orsrat rsorat srorat osrrat sorrat rorsat orrsat rrosat rrosat orrsat rorsat rsroat srroat rrsoat rrsoat srroat rsroat osrrat sorrat orsrat rosrat srorat rsorat rosart orsart rsoart sroart osrart sorart roasrt orasrt raosrt arosrt oarsrt aorsrt rsaort sraort rasort arsort sarort asrort osarrt soarrt oasrrt aosrrt saorrt asorrt rorast orrast rroast rroast orrast rorast roarst orarst raorst arorst oarrst aorrst rraost rraost rarost arrost rarost arrost orarst roarst oarrst aorrst raorst arorst rsraot srraot rrsaot rrsaot srraot rsraot rsarot srarot rasrot arsrot sarrot asrrot rrasot rrasot rarsot arrsot rarsot arrsot srarot rsarot sarrot asrrot rasrot arsrot osrart sorart orsart rosart sroart rsoart osarrt soarrt oasrrt aosrrt saorrt asorrt orasrt roasrt oarsrt aorsrt raosrt arosrt sraort rsaort sarort asrort rasort arsort rotras ortras rtoras troras otrras torras rortas orrtas rrotas rrotas orrtas rortas rtroas trroas rrtoas rrtoas trroas rtroas otrras torras ortras rotras troras rtoras rotars ortars rtoars troars otrars torars roatrs oratrs raotrs arotrs oartrs aortrs rtaors traors rators artors tarors atrors otarrs toarrs oatrrs aotrrs taorrs atorrs rorats orrats rroats rroats orrats rorats roarts orarts raorts arorts oarrts aorrts rraots rraots rarots arrots rarots arrots orarts roarts oarrts aorrts raorts arorts rtraos trraos rrtaos rrtaos trraos rtraos rtaros traros ratros artros tarros atrros rratos rratos rartos arrtos rartos arrtos traros rtaros tarros atrros ratros artros otrars torars ortars rotars troars rtoars otarrs toarrs oatrrs aotrrs taorrs atorrs oratrs roatrs oartrs aortrs raotrs arotrs traors rtaors tarors atrors rators artors rstrao srtrao rtsrao trsrao strrao tsrrao rsrtao srrtao rrstao rrstao srrtao rsrtao rtrsao trrsao rrtsao rrtsao trrsao rtrsao strrao tsrrao srtrao rstrao trsrao rtsrao rstaro srtaro rtsaro trsaro straro tsraro rsatro sratro rastro arstro sartro asrtro rtasro trasro ratsro artsro tarsro atrsro starro tsarro satrro astrro tasrro atsrro rsrato srrato rrsato rrsato srrato rsrato rsarto srarto rasrto arsrto sarrto asrrto rrasto rrasto rarsto arrsto rarsto arrsto srarto rsarto sarrto asrrto rasrto arsrto rtraso trraso rrtaso rrtaso trraso rtraso rtarso trarso ratrso artrso tarrso atrrso rratso rratso rartso arrtso rartso arrtso trarso rtarso tarrso atrrso ratrso artrso straro tsraro srtaro rstaro trsaro rtsaro starro tsarro satrro astrro tasrro atsrro sratro rsatro sartro asrtro rastro arstro trasro rtasro tarsro atrsro ratsro artsro ostrar sotrar otsrar tosrar storar tsorar osrtar sortar orstar rostar srotar rsotar otrsar torsar ortsar rotsar trosar rtosar stroar tsroar srtoar rstoar trsoar rtsoar ostarr sotarr otsarr tosarr stoarr tsoarr osatrr soatrr oastrr aostrr saotrr asotrr otasrr toasrr oatsrr aotsrr taosrr atosrr staorr tsaorr satorr astorr tasorr atsorr osratr soratr orsatr rosatr sroatr rsoatr osartr soartr oasrtr aosrtr saortr asortr orastr roastr oarstr aorstr raostr arostr sraotr rsaotr sarotr asrotr rasotr arsotr otrasr torasr ortasr rotasr troasr rtoasr otarsr toarsr oatrsr aotrsr taorsr atorsr oratsr roatsr oartsr aortsr raotsr arotsr traosr rtaosr tarosr atrosr ratosr artosr straor tsraor srtaor rstaor trsaor rtsaor staror tsaror satror astror tasror atsror srator rsator sartor asrtor rastor arstor trasor rtasor tarsor atrsor ratsor artsor
Note: these 'words' (valid or invalid) are all the permutations of the word rostra. These words are obtained by scrambling the letters in rostra.