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Precondition
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===Preconditions and inheritance=== In the presence of inheritance, the routines inherited by descendant classes (subclasses) do so with their preconditions in force. This means that any implementations or redefinitions of inherited routines also have to be written to comply with their inherited contract. Preconditions can be modified in redefined routines, but they may only be weakened.<ref>Meyer, 1997, pp. 570β573.</ref> That is, the redefined routine may lessen the obligation of the client, but not increase it.
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