ubrat burat urbat rubat bruat rbuat ubart buart uabrt aubrt baurt aburt urabt ruabt uarbt aurbt raubt arubt braut rbaut barut abrut rabut arbut ubrta burta urbta rubta bruta rbuta ubtra butra utbra tubra btura tbura urtba rutba utrba turba rtuba truba brtua rbtua btrua tbrua rtbua trbua ubatr buatr uabtr aubtr bautr abutr ubtar butar utbar tubar btuar tbuar uatbr autbr utabr tuabr atubr taubr batur abtur btaur tbaur atbur tabur uratb ruatb uartb aurtb rautb arutb urtab rutab utrab turab rtuab truab uatrb autrb utarb tuarb aturb taurb ratub artub rtaub traub atrub tarub bratu rbatu bartu abrtu rabtu arbtu brtau rbtau btrau tbrau rtbau trbau batru abtru btaru tbaru atbru tabru ratbu artbu rtabu trabu atrbu tarbu
Note: these 'words' (valid or invalid) are all the permutations of the word ubrat. These words are obtained by scrambling the letters in ubrat.