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