prbsa rpbsa pbrsa bprsa rbpsa brpsa prsba rpsba psrba sprba rspba srpba pbsra bpsra psbra spbra bspra sbpra rbspa brspa rsbpa srbpa bsrpa sbrpa prbas rpbas pbras bpras rbpas brpas prabs rpabs parbs aprbs rapbs arpbs pbars bpars pabrs apbrs baprs abprs rbaps braps rabps arbps barps abrps prsab rpsab psrab sprab rspab srpab prasb rpasb parsb aprsb rapsb arpsb psarb sparb pasrb apsrb saprb asprb rsapb srapb raspb arspb sarpb asrpb pbsar bpsar psbar spbar bspar sbpar pbasr bpasr pabsr apbsr bapsr abpsr psabr spabr pasbr apsbr sapbr aspbr bsapr sbapr baspr abspr sabpr asbpr rbsap brsap rsbap srbap bsrap sbrap rbasp brasp rabsp arbsp barsp abrsp rsabp srabp rasbp arsbp sarbp asrbp bsarp sbarp basrp absrp sabrp asbrp
Note: these 'words' (valid or invalid) are all the permutations of the word prbsa. These words are obtained by scrambling the letters in prbsa.