rubma urbma rbuma bruma ubrma burma rumba urmba rmuba mruba umrba murba rbmua brmua rmbua mrbua bmrua mbrua ubmra bumra umbra mubra bmura mbura rubam urbam rbuam bruam ubram buram ruabm urabm raubm arubm uarbm aurbm rbaum braum rabum arbum barum abrum ubarm buarm uabrm aubrm baurm aburm rumab urmab rmuab mruab umrab murab ruamb uramb raumb arumb uarmb aurmb rmaub mraub ramub armub marub amrub umarb muarb uamrb aumrb maurb amurb rbmau brmau rmbau mrbau bmrau mbrau rbamu bramu rabmu arbmu barmu abrmu rmabu mrabu rambu armbu marbu amrbu bmaru mbaru bamru abmru mabru ambru ubmar bumar umbar mubar bmuar mbuar ubamr buamr uabmr aubmr baumr abumr umabr muabr uambr aumbr maubr amubr bmaur mbaur bamur abmur mabur ambur
Note: these 'words' (valid or invalid) are all the permutations of the word rubma. These words are obtained by scrambling the letters in rubma.