pirog iprog priog rpiog irpog ripog piorg iporg poirg opirg ioprg oiprg proig rpoig porig oprig ropig orpig iropg riopg iorpg oirpg roipg oripg pirgo iprgo prigo rpigo irpgo ripgo pigro ipgro pgiro gpiro igpro gipro prgio rpgio pgrio gprio rgpio grpio irgpo rigpo igrpo girpo rgipo gripo piogr ipogr poigr opigr iopgr oipgr pigor ipgor pgior gpior igpor gipor pogir opgir pgoir gpoir ogpir gopir iogpr oigpr igopr giopr ogipr goipr progi rpogi porgi oprgi ropgi orpgi prgoi rpgoi pgroi gproi rgpoi grpoi pogri opgri pgori gpori ogpri gopri rogpi orgpi rgopi gropi ogrpi gorpi irogp riogp iorgp oirgp roigp origp irgop rigop igrop girop rgiop griop iogrp oigrp igorp giorp ogirp goirp rogip orgip rgoip groip ogrip gorip
Note: these 'words' (valid or invalid) are all the permutations of the word pirog. These words are obtained by scrambling the letters in pirog.