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Rule
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When something always does the same thing, one can say that there is a rule that it does what it does.
The word "rule" has many uses, including the following:
 A means of measurement (such as a slide rule.)
 A law or regulation.
 A precedent or conclusion drawn from experiments.
A "rule" in mathematics is a formula which allows a person to work out parts of the solution if he or she has certain information. For example, Pythagoras' theorem is a rule which states that if a person knows the lengths of two sides of a rightangled triangle he or she can work out the length of the third.
Rules, however, can also means laws created by people in power  for example, school rules are the "laws" of a specific school.
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