proto rpoto porto oprto ropto orpto prtoo rptoo ptroo tproo rtpoo trpoo potro optro ptoro tporo otpro topro rotpo ortpo rtopo tropo otrpo torpo proot rpoot porot oprot ropot orpot proot rpoot porot oprot ropot orpot poort oport poort oport ooprt ooprt roopt oropt roopt oropt oorpt oorpt prtoo rptoo ptroo tproo rtpoo trpoo proto rpoto porto oprto ropto orpto ptoro tporo potro optro topro otpro rtopo tropo rotpo ortpo torpo otrpo potor optor ptoor tpoor otpor topor pootr opotr pootr opotr ooptr ooptr ptoor tpoor potor optor topor otpor otopr toopr ootpr ootpr toopr otopr rotop ortop rtoop troop otrop torop rootp orotp rootp orotp oortp oortp rtoop troop rotop ortop torop otrop otorp toorp ootrp ootrp toorp otorp
Note: these 'words' (valid or invalid) are all the permutations of the word proto. These words are obtained by scrambling the letters in proto.