napir anpir npair pnair apnir panir naipr anipr niapr inapr ainpr ianpr npiar pniar nipar inpar pinar ipnar apinr painr aipnr iapnr pianr ipanr napri anpri npari pnari apnri panri narpi anrpi nrapi rnapi arnpi ranpi nprai pnrai nrpai rnpai prnai rpnai aprni parni arpni rapni prani rpani nairp anirp niarp inarp ainrp ianrp narip anrip nraip rnaip arnip ranip nirap inrap nriap rniap irnap rinap airnp iarnp arinp rainp iranp rianp npira pnira nipra inpra pinra ipnra npria pnria nrpia rnpia prnia rpnia nirpa inrpa nripa rnipa irnpa rinpa pirna iprna prina rpina irpna ripna apirn pairn aiprn iaprn piarn iparn aprin parin arpin rapin prain rpain airpn iarpn aripn raipn irapn riapn piran ipran prian rpian irpan ripan
Note: these 'words' (valid or invalid) are all the permutations of the word napir. These words are obtained by scrambling the letters in napir.