droug rdoug dorug odrug rodug ordug druog rduog durog udrog rudog urdog dourg odurg duorg udorg oudrg uodrg roudg orudg ruodg urodg ourdg uordg drogu rdogu dorgu odrgu rodgu ordgu drgou rdgou dgrou gdrou rgdou grdou dogru odgru dgoru gdoru ogdru godru rogdu orgdu rgodu grodu ogrdu gordu drugo rdugo durgo udrgo rudgo urdgo drguo rdguo dgruo gdruo rgduo grduo dugro udgro dguro gduro ugdro gudro rugdo urgdo rgudo grudo ugrdo gurdo dougr odugr duogr udogr oudgr uodgr dogur odgur dgour gdour ogdur godur dugor udgor dguor gduor ugdor gudor ougdr uogdr ogudr goudr ugodr guodr rougd orugd ruogd urogd ourgd uorgd rogud orgud rgoud groud ogrud gorud rugod urgod rguod gruod ugrod gurod ougrd uogrd ogurd gourd ugord guord
Note: these 'words' (valid or invalid) are all the permutations of the word droug. These words are obtained by scrambling the letters in droug.