Dakko (depriving the world with your mouth) was originally the skill of imitating the dialects of more than 60 provinces fluently. According to the Shoninki, those who mastered the skill knew all the historic spots and famous areas of beauty in each province. However, only the ancient masters could become proficient in it. The shinobi of the Edo period could be easily interpreted as being con men using hatonokai (tricks of street con men) for trying to use this skill