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The system that is used to make a deduction that is stored in the database is called deductive database. To specify queries, facts and rules it uses datalog as the typical language.
The metric system
They are the U.S. measurements. Instead of the Metric system that uses meters, the Customary system uses feet and inches.
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Only three countries still cling to the "English" system, whereas the whole world uses metric. The SI units were established in 1960 as part of a review of the metric system used at the time; it uses metric units because it is the current version of the metric system.