roper orper rpoer proer oprer porer roepr orepr reopr eropr oerpr eorpr rpeor preor repor erpor peror epror operr poerr oeprr eoprr peorr eporr ropre orpre rpore prore oprre porre rorpe orrpe rrope rrope orrpe rorpe rproe prroe rrpoe rrpoe prroe rproe oprre porre orpre ropre prore rpore roerp orerp reorp erorp oerrp eorrp rorep orrep rroep rroep orrep rorep rerop errop rreop rreop errop rerop oerrp eorrp orerp roerp erorp reorp rpero prero repro erpro perro eprro rpreo prreo rrpeo rrpeo prreo rpreo rerpo errpo rrepo rrepo errpo rerpo perro eprro prero rpero erpro repro operr poerr oeprr eoprr peorr eporr oprer porer orper roper proer rpoer oerpr eorpr orepr roepr eropr reopr peror epror preor rpeor erpor repor
Note: these 'words' (valid or invalid) are all the permutations of the word roper. These words are obtained by scrambling the letters in roper.