nairu aniru niaru inaru ainru ianru nariu anriu nraiu rnaiu arniu raniu nirau inrau nriau rniau irnau rinau airnu iarnu arinu rainu iranu rianu naiur aniur niaur inaur ainur ianur nauir anuir nuair unair aunir uanir niuar inuar nuiar uniar iunar uinar aiunr iaunr auinr uainr iuanr uianr narui anrui nraui rnaui arnui ranui nauri anuri nuari unari aunri uanri nruai rnuai nurai unrai runai urnai aruni rauni aurni uarni ruani urani nirua inrua nriua rniua irnua rinua niura inura nuira unira iunra uinra nruia rnuia nuria unria runia urnia iruna riuna iurna uirna ruina urina airun iarun ariun raiun iraun riaun aiurn iaurn auirn uairn iuarn uiarn aruin rauin aurin uarin ruain urain iruan riuan iuran uiran ruian urian
Note: these 'words' (valid or invalid) are all the permutations of the word nairu. These words are obtained by scrambling the letters in nairu.