airtb iartb aritb raitb iratb riatb aitrb iatrb atirb tairb itarb tiarb artib ratib atrib tarib rtaib traib irtab ritab itrab tirab rtiab triab airbt iarbt aribt raibt irabt riabt aibrt iabrt abirt bairt ibart biart arbit rabit abrit barit rbait brait irbat ribat ibrat birat rbiat briat aitbr iatbr atibr taibr itabr tiabr aibtr iabtr abitr baitr ibatr biatr atbir tabir abtir batir tbair btair itbar tibar ibtar bitar tbiar btiar artbi ratbi atrbi tarbi rtabi trabi arbti rabti abrti barti rbati brati atbri tabri abtri batri tbari btari rtbai trbai rbtai brtai tbrai btrai irtba ritba itrba tirba rtiba triba irbta ribta ibrta birta rbita brita itbra tibra ibtra bitra tbira btira rtbia trbia rbtia brtia tbria btria
Note: these 'words' (valid or invalid) are all the permutations of the word airtb. These words are obtained by scrambling the letters in airtb.