bdcra dbcra bcdra cbdra dcbra cdbra bdrca dbrca brdca rbdca drbca rdbca bcrda cbrda brcda rbcda crbda rcbda dcrba cdrba drcba rdcba crdba rcdba bdcar dbcar bcdar cbdar dcbar cdbar bdacr dbacr badcr abdcr dabcr adbcr bcadr cbadr bacdr abcdr cabdr acbdr dcabr cdabr dacbr adcbr cadbr acdbr bdrac dbrac brdac rbdac drbac rdbac bdarc dbarc badrc abdrc dabrc adbrc bradc rbadc bardc abrdc rabdc arbdc drabc rdabc darbc adrbc radbc ardbc bcrad cbrad brcad rbcad crbad rcbad bcard cbard bacrd abcrd cabrd acbrd bracd rbacd barcd abrcd rabcd arbcd crabd rcabd carbd acrbd racbd arcbd dcrab cdrab drcab rdcab crdab rcdab dcarb cdarb dacrb adcrb cadrb acdrb dracb rdacb darcb adrcb radcb ardcb cradb rcadb cardb acrdb racdb arcdb
Note: these 'words' (valid or invalid) are all the permutations of the word bdcra. These words are obtained by scrambling the letters in bdcra.