pidus ipdus pdius dpius idpus dipus piuds ipuds puids upids iupds uipds pduis dpuis pudis updis dupis udpis idups diups iudps uidps duips udips pidsu ipdsu pdisu dpisu idpsu dipsu pisdu ipsdu psidu spidu ispdu sipdu pdsiu dpsiu psdiu spdiu dspiu sdpiu idspu dispu isdpu sidpu dsipu sdipu piusd ipusd puisd upisd iupsd uipsd pisud ipsud psiud spiud ispud sipud pusid upsid psuid spuid uspid supid iuspd uispd isupd siupd usipd suipd pdusi dpusi pudsi updsi dupsi udpsi pdsui dpsui psdui spdui dspui sdpui pusdi upsdi psudi spudi uspdi supdi duspi udspi dsupi sdupi usdpi sudpi idusp diusp iudsp uidsp duisp udisp idsup disup isdup sidup dsiup sdiup iusdp uisdp isudp siudp usidp suidp dusip udsip dsuip sduip usdip sudip
Note: these 'words' (valid or invalid) are all the permutations of the word pidus. These words are obtained by scrambling the letters in pidus.