sadhu asdhu sdahu dsahu adshu dashu sahdu ashdu shadu hsadu ahsdu hasdu sdhau dshau shdau hsdau dhsau hdsau adhsu dahsu ahdsu hadsu dhasu hdasu saduh asduh sdauh dsauh adsuh dasuh saudh asudh suadh usadh ausdh uasdh sduah dsuah sudah usdah dusah udsah adush daush audsh uadsh duash udash sahud ashud shaud hsaud ahsud hasud sauhd asuhd suahd usahd aushd uashd shuad hsuad suhad ushad husad uhsad ahusd hausd auhsd uahsd huasd uhasd sdhua dshua shdua hsdua dhsua hdsua sduha dsuha sudha usdha dusha udsha shuda hsuda suhda ushda husda uhsda dhusa hdusa duhsa udhsa hudsa uhdsa adhus dahus ahdus hadus dhaus hdaus aduhs dauhs audhs uadhs duahs udahs ahuds hauds auhds uahds huads uhads dhuas hduas duhas udhas hudas uhdas
Note: these 'words' (valid or invalid) are all the permutations of the word sadhu. These words are obtained by scrambling the letters in sadhu.