sprog psrog srpog rspog prsog rpsog sporg psorg soprg osprg posrg opsrg sropg rsopg sorpg osrpg rospg orspg prosg rposg porsg oprsg ropsg orpsg sprgo psrgo srpgo rspgo prsgo rpsgo spgro psgro sgpro gspro pgsro gpsro srgpo rsgpo sgrpo gsrpo rgspo grspo prgso rpgso pgrso gprso rgpso grpso spogr psogr sopgr ospgr posgr opsgr spgor psgor sgpor gspor pgsor gpsor sogpr osgpr sgopr gsopr ogspr gospr pogsr opgsr pgosr gposr ogpsr gopsr srogp rsogp sorgp osrgp rosgp orsgp srgop rsgop sgrop gsrop rgsop grsop sogrp osgrp sgorp gsorp ogsrp gosrp rogsp orgsp rgosp grosp ogrsp gorsp progs rpogs porgs oprgs ropgs orpgs prgos rpgos pgros gpros rgpos grpos pogrs opgrs pgors gpors ogprs goprs rogps orgps rgops grops ogrps gorps
Note: these 'words' (valid or invalid) are all the permutations of the word sprog. These words are obtained by scrambling the letters in sprog.