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if a company recalls one of its products, it asks people who have bought it to return it because there may be something wrong with it
the basic systems and structures that a country or organization needs in order to work properly, for example roads, railways, banks etc
an occasion when people or supplies are taken to a place by plane, especially during a war or dangerous situation
relating to the central government of a country such as the US, rather than the government of one of its states
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