7. masculine stems ending in -u (paradigm watru-, enemy):
 
  Sg. Du. Pl.
Nom. watruh watru watravah
Acc. watrum watru watrun
Ins. watruna watrubhyam watrubhih
Dat. watrave watrubhyam watrubhyah
Abl. watroh watrubhyam watrubhyah
Gen. watroh watrvoh watrunam
Loc. watrau watrvoh watrusu
Voc. watro watru watravah