burps ubrps brups rbups urbps rubps buprs ubprs bpurs pburs upbrs pubrs brpus rbpus bprus pbrus rpbus prbus urpbs rupbs uprbs purbs rpubs prubs bursp ubrsp brusp rbusp urbsp rubsp busrp ubsrp bsurp sburp usbrp subrp brsup rbsup bsrup sbrup rsbup srbup ursbp rusbp usrbp surbp rsubp srubp bupsr ubpsr bpusr pbusr upbsr pubsr buspr ubspr bsupr sbupr usbpr subpr bpsur pbsur bspur sbpur psbur spbur upsbr pusbr uspbr supbr psubr spubr brpsu rbpsu bprsu pbrsu rpbsu prbsu brspu rbspu bsrpu sbrpu rsbpu srbpu bpsru pbsru bspru sbpru psbru spbru rpsbu prsbu rspbu srpbu psrbu sprbu urpsb rupsb uprsb pursb rpusb prusb urspb ruspb usrpb surpb rsupb srupb upsrb pusrb usprb suprb psurb spurb rpsub prsub rspub srpub psrub sprub
Note: these 'words' (valid or invalid) are all the permutations of the word burps. These words are obtained by scrambling the letters in burps.