rpuns pruns rupns urpns purns uprns rpnus prnus rnpus nrpus pnrus nprus runps urnps rnups nrups unrps nurps punrs upnrs pnurs npurs unprs nuprs rpusn prusn rupsn urpsn pursn uprsn rpsun prsun rspun srpun psrun sprun ruspn urspn rsupn srupn usrpn surpn pusrn upsrn psurn spurn usprn suprn rpnsu prnsu rnpsu nrpsu pnrsu nprsu rpsnu prsnu rspnu srpnu psrnu sprnu rnspu nrspu rsnpu srnpu nsrpu snrpu pnsru npsru psnru spnru nspru snpru runsp urnsp rnusp nrusp unrsp nursp rusnp ursnp rsunp srunp usrnp surnp rnsup nrsup rsnup srnup nsrup snrup unsrp nusrp usnrp sunrp nsurp snurp punsr upnsr pnusr npusr unpsr nupsr pusnr upsnr psunr spunr uspnr supnr pnsur npsur psnur spnur nspur snpur unspr nuspr usnpr sunpr nsupr snupr
Note: these 'words' (valid or invalid) are all the permutations of the word rpuns. These words are obtained by scrambling the letters in rpuns.