cobra ocbra cbora bcora obcra bocra corba ocrba croba rcoba orcba rocba cbroa bcroa crboa rcboa brcoa rbcoa obrca borca orbca robca broca rboca cobar ocbar cboar bcoar obcar bocar coabr ocabr caobr acobr oacbr aocbr cbaor bcaor cabor acbor bacor abcor obacr boacr oabcr aobcr baocr abocr corab ocrab croab rcoab orcab rocab coarb ocarb caorb acorb oacrb aocrb craob rcaob carob acrob racob arcob oracb roacb oarcb aorcb raocb arocb cbrao bcrao crbao rcbao brcao rbcao cbaro bcaro cabro acbro bacro abcro crabo rcabo carbo acrbo racbo arcbo braco rbaco barco abrco rabco arbco obrac borac orbac robac broac rboac obarc boarc oabrc aobrc baorc aborc orabc roabc oarbc aorbc raobc arobc braoc rbaoc baroc abroc raboc arboc
Note: these 'words' (valid or invalid) are all the permutations of the word cobra. These words are obtained by scrambling the letters in cobra.