rubai urbai rbuai bruai ubrai burai ruabi urabi raubi arubi uarbi aurbi rbaui braui rabui arbui barui abrui ubari buari uabri aubri bauri aburi rubia urbia rbuia bruia ubria buria ruiba uriba riuba iruba uirba iurba rbiua briua ribua irbua birua ibrua ubira buira uibra iubra biura ibura ruaib uraib rauib aruib uarib aurib ruiab uriab riuab iruab uirab iurab raiub ariub riaub iraub airub iarub uairb auirb uiarb iuarb aiurb iaurb rbaiu braiu rabiu arbiu bariu abriu rbiau briau ribau irbau birau ibrau raibu aribu riabu irabu airbu iarbu bairu abiru biaru ibaru aibru iabru ubair buair uabir aubir bauir abuir ubiar buiar uibar iubar biuar ibuar uaibr auibr uiabr iuabr aiubr iaubr baiur abiur biaur ibaur aibur iabur
Note: these 'words' (valid or invalid) are all the permutations of the word rubai. These words are obtained by scrambling the letters in rubai.