unrig nurig urnig runig nruig rnuig unirg nuirg uinrg iunrg niurg inurg uring ruing uirng iurng riung irung nriug rniug nirug inrug rinug irnug unrgi nurgi urngi rungi nrugi rnugi ungri nugri ugnri gunri nguri gnuri urgni rugni ugrni gurni rguni gruni nrgui rngui ngrui gnrui rgnui grnui unigr nuigr uingr iungr niugr inugr ungir nugir ugnir gunir nguir gnuir uignr iugnr uginr guinr igunr giunr nigur ingur ngiur gniur ignur ginur urign ruign uirgn iurgn riugn irugn urgin rugin ugrin gurin rguin gruin uigrn iugrn ugirn guirn igurn giurn rigun irgun rgiun griun igrun girun nrigu rnigu nirgu inrgu ringu irngu nrgiu rngiu ngriu gnriu rgniu grniu nigru ingru ngiru gniru ignru ginru rignu irgnu rginu grinu igrnu girnu
Note: these 'words' (valid or invalid) are all the permutations of the word unrig. These words are obtained by scrambling the letters in unrig.