dhows hdows dohws odhws hodws ohdws dhwos hdwos dwhos wdhos hwdos whdos dowhs odwhs dwohs wdohs owdhs wodhs howds ohwds hwods whods owhds wohds dhosw hdosw dohsw odhsw hodsw ohdsw dhsow hdsow dshow sdhow hsdow shdow doshw odshw dsohw sdohw osdhw sodhw hosdw ohsdw hsodw shodw oshdw sohdw dhwso hdwso dwhso wdhso hwdso whdso dhswo hdswo dshwo sdhwo hsdwo shdwo dwsho wdsho dswho sdwho wsdho swdho hwsdo whsdo hswdo shwdo wshdo swhdo dowsh odwsh dwosh wdosh owdsh wodsh doswh odswh dsowh sdowh osdwh sodwh dwsoh wdsoh dswoh sdwoh wsdoh swdoh owsdh wosdh oswdh sowdh wsodh swodh howsd ohwsd hwosd whosd owhsd wohsd hoswd ohswd hsowd showd oshwd sohwd hwsod whsod hswod shwod wshod swhod owshd woshd oswhd sowhd wsohd swohd
Note: these 'words' (valid or invalid) are all the permutations of the word dhows. These words are obtained by scrambling the letters in dhows.