The formulation of many rules has a special background of the times, in order to achieve a special purpose, and will always be inclined to those who make the rules. For example, some legal systems are extraordinarily complicated and obscure, with lengthy and contradictory lines, and piles of cases. One of the purposes is to make it difficult for ordinary people to understand the law, so that the law becomes a tool for lawyers, judges, and other groups. The other system, on the other hand, tends to open a mouth for each clause to facilitate its own interpretation.

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