In this village it is the custom that each year the cows are taken to the mountains of Urbasa to graze, being decission of the justice to take them there at the time it best considered as well as [to decide] when they have to leave [the mountains], and, during that time, no bullock  older than 3 years shall stay within the district, and they agree that this custom shall remain valid and effective in the way indicated in this article.