And the article also says that there existed a weight units' system peculiar to those things, in which '6 shu were equivalent to 1 bu, 4 bu to 1 ryo, 12 ryo to 1 ton, 16 ryo to 1 small kin, and 3 kin to 1 large kin.
そしてこれらにつき「6銖を1分、4分を1両、12両を1屯、16両を小1斤、3斤を大1斤」とする単位系が記述されている。