rabis arbis rbais brais abris baris raibs aribs riabs irabs airbs iarbs rbias brias ribas irbas biras ibras abirs bairs aibrs iabrs biars ibars rabsi arbsi rbasi brasi abrsi barsi rasbi arsbi rsabi srabi asrbi sarbi rbsai brsai rsbai srbai bsrai sbrai absri basri asbri sabri bsari sbari raisb arisb riasb irasb airsb iarsb rasib arsib rsaib sraib asrib sarib risab irsab rsiab sriab israb sirab aisrb iasrb asirb sairb isarb siarb rbisa brisa ribsa irbsa birsa ibrsa rbsia brsia rsbia srbia bsria sbria risba irsba rsiba sriba isrba sirba bisra ibsra bsira sbira isbra sibra abisr baisr aibsr iabsr biasr ibasr absir basir asbir sabir bsair sbair aisbr iasbr asibr saibr isabr siabr bisar ibsar bsiar sbiar isbar sibar
Note: these 'words' (valid or invalid) are all the permutations of the word rabis. These words are obtained by scrambling the letters in rabis.