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