ridon irdon rdion drion idron diron riodn irodn roidn oridn iordn oirdn rdoin droin rodin ordin dorin odrin idorn diorn iodrn oidrn doirn odirn ridno irdno rdino drino idrno dirno rindo irndo rnido nrido inrdo nirdo rdnio drnio rndio nrdio dnrio ndrio idnro dinro indro nidro dniro ndiro riond irond roind orind iornd oirnd rinod irnod rniod nriod inrod nirod ronid ornid rnoid nroid onrid norid ionrd oinrd inord niord onird noird rdoni droni rodni ordni dorni odrni rdnoi drnoi rndoi nrdoi dnroi ndroi rondi orndi rnodi nrodi onrdi nordi donri odnri dnori ndori ondri nodri idonr dionr iodnr oidnr doinr odinr idnor dinor indor nidor dnior ndior iondr oindr inodr niodr onidr noidr donir odnir dnoir ndoir ondir nodir
Note: these 'words' (valid or invalid) are all the permutations of the word ridon. These words are obtained by scrambling the letters in ridon.