ecrib cerib ercib recib creib rceib ecirb ceirb eicrb iecrb cierb icerb ericb reicb eircb iercb riecb irecb crieb rcieb cireb icreb riceb irceb ecrbi cerbi ercbi recbi crebi rcebi ecbri cebri ebcri becri cberi bceri erbci rebci ebrci berci rbeci breci crbei rcbei cbrei bcrei rbcei brcei ecibr ceibr eicbr iecbr ciebr icebr ecbir cebir ebcir becir cbeir bceir eibcr iebcr ebicr beicr ibecr biecr ciber icber cbier bcier ibcer bicer eribc reibc eirbc ierbc riebc irebc erbic rebic ebric beric rbeic breic eibrc iebrc ebirc beirc iberc bierc ribec irbec rbiec briec ibrec birec cribe rcibe cirbe icrbe ricbe ircbe crbie rcbie cbrie bcrie rbcie brcie cibre icbre cbire bcire ibcre bicre ribce irbce rbice brice ibrce birce
Note: these 'words' (valid or invalid) are all the permutations of the word ecrib. These words are obtained by scrambling the letters in ecrib.