arbor rabor abror baror rbaor braor arobr raobr aorbr oarbr roabr orabr aborr baorr aobrr oabrr boarr obarr rboar broar robar orbar borar obrar arbro rabro abrro barro rbaro braro arrbo rarbo arrbo rarbo rrabo rrabo abrro barro arbro rabro braro rbaro rbrao brrao rrbao rrbao brrao rbrao arorb raorb aorrb oarrb roarb orarb arrob rarob arrob rarob rraob rraob aorrb oarrb arorb raorb orarb roarb rorab orrab rroab rroab orrab rorab aborr baorr aobrr oabrr boarr obarr abror baror arbor rabor braor rbaor aorbr oarbr arobr raobr orabr roabr borar obrar broar rboar orbar robar rbora brora robra orbra borra obrra rbroa brroa rrboa rrboa brroa rbroa rorba orrba rroba rroba orrba rorba borra obrra brora rbora orbra robra
Note: these 'words' (valid or invalid) are all the permutations of the word arbor. These words are obtained by scrambling the letters in arbor.