bcour cbour bocur obcur cobur ocbur bcuor cbuor bucor ubcor cubor ucbor boucr obucr buocr ubocr oubcr uobcr coubr ocubr cuobr ucobr oucbr uocbr bcoru cboru bocru obcru cobru ocbru bcrou cbrou brcou rbcou crbou rcbou borcu obrcu brocu rbocu orbcu robcu corbu ocrbu crobu rcobu orcbu rocbu bcuro cburo bucro ubcro cubro ucbro bcruo cbruo brcuo rbcuo crbuo rcbuo burco ubrco bruco rbuco urbco rubco curbo ucrbo crubo rcubo urcbo rucbo bourc oburc buorc uborc oubrc uobrc boruc obruc brouc rbouc orbuc robuc buroc ubroc bruoc rbuoc urboc ruboc ourbc uorbc orubc roubc urobc ruobc courb ocurb cuorb ucorb oucrb uocrb corub ocrub croub rcoub orcub rocub curob ucrob cruob rcuob urcob rucob ourcb uorcb orucb roucb urocb ruocb
Note: these 'words' (valid or invalid) are all the permutations of the word bcour. These words are obtained by scrambling the letters in bcour.