bulla ublla blula lbula ulbla lubla bulla ublla blula lbula ulbla lubla bllua lblua bllua lblua llbua llbua ullba lulba ullba lulba lluba lluba bulal ublal blual lbual ulbal lubal buall uball baull abull uabll aubll blaul lbaul balul ablul labul albul ulabl luabl ualbl aulbl laubl alubl bulal ublal blual lbual ulbal lubal buall uball baull abull uabll aubll blaul lbaul balul ablul labul albul ulabl luabl ualbl aulbl laubl alubl bllau lblau bllau lblau llbau llbau blalu lbalu ballu abllu lablu alblu blalu lbalu ballu abllu lablu alblu llabu llabu lalbu allbu lalbu allbu ullab lulab ullab lulab lluab lluab ulalb lualb uallb aullb laulb alulb ulalb lualb uallb aullb laulb alulb llaub llaub lalub allub lalub allub
Note: these 'words' (valid or invalid) are all the permutations of the word bulla. These words are obtained by scrambling the letters in bulla.