rsdis srdis rdsis drsis sdris dsris rsids srids risds irsds sirds isrds rdiss driss ridss irdss dirss idrss sdirs dsirs sidrs isdrs disrs idsrs rsdsi srdsi rdssi drssi sdrsi dsrsi rssdi srsdi rssdi srsdi ssrdi ssrdi rdssi drssi rsdsi srdsi dsrsi sdrsi sdsri dssri ssdri ssdri dssri sdsri rsisd srisd rissd irssd sirsd isrsd rssid srsid rssid srsid ssrid ssrid rissd irssd rsisd srisd isrsd sirsd sisrd issrd ssird ssird issrd sisrd rdiss driss ridss irdss dirss idrss rdsis drsis rsdis srdis dsris sdris risds irsds rsids srids isrds sirds disrs idsrs dsirs sdirs isdrs sidrs sdisr dsisr sidsr isdsr dissr idssr sdsir dssir ssdir ssdir dssir sdsir sisdr issdr ssidr ssidr issdr sisdr dissr idssr dsisr sdisr isdsr sidsr
Note: these 'words' (valid or invalid) are all the permutations of the word rsdis. These words are obtained by scrambling the letters in rsdis.