doris odris drois rdois ordis rodis doirs odirs diors idors oidrs iodrs drios rdios diros idros ridos irdos orids roids oirds iords riods irods dorsi odrsi drosi rdosi ordsi rodsi dosri odsri dsori sdori osdri sodri drsoi rdsoi dsroi sdroi rsdoi srdoi orsdi rosdi osrdi sordi rsodi srodi doisr odisr diosr idosr oidsr iodsr dosir odsir dsoir sdoir osdir sodir disor idsor dsior sdior isdor sidor oisdr iosdr osidr soidr isodr siodr driso rdiso dirso idrso ridso irdso drsio rdsio dsrio sdrio rsdio srdio disro idsro dsiro sdiro isdro sidro risdo irsdo rsido srido isrdo sirdo orisd roisd oirsd iorsd riosd irosd orsid rosid osrid sorid rsoid sroid oisrd iosrd osird soird isord siord risod irsod rsiod sriod isrod sirod
Note: these 'words' (valid or invalid) are all the permutations of the word doris. These words are obtained by scrambling the letters in doris.