obdpi bodpi odbpi dobpi bdopi dbopi obpdi bopdi opbdi pobdi bpodi pbodi odpbi dopbi opdbi podbi dpobi pdobi bdpoi dbpoi bpdoi pbdoi dpboi pdboi obdip bodip odbip dobip bdoip dboip obidp boidp oibdp iobdp biodp ibodp odibp doibp oidbp iodbp diobp idobp bdiop dbiop bidop ibdop dibop idbop obpid bopid opbid pobid bpoid pboid obipd boipd oibpd iobpd biopd ibopd opibd poibd oipbd iopbd piobd ipobd bpiod pbiod bipod ibpod pibod ipbod odpib dopib opdib podib dpoib pdoib odipb doipb oidpb iodpb diopb idopb opidb poidb oipdb iopdb piodb ipodb dpiob pdiob dipob idpob pidob ipdob bdpio dbpio bpdio pbdio dpbio pdbio bdipo dbipo bidpo ibdpo dibpo idbpo bpido pbido bipdo ibpdo pibdo ipbdo dpibo pdibo dipbo idpbo pidbo ipdbo
Note: these 'words' (valid or invalid) are all the permutations of the word obdpi. These words are obtained by scrambling the letters in obdpi.