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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_direct_derivatives(self, address):
 """Get all targets derived directly from the specified target. Note that the specified target itself is not returned. :API: public """

    derivative_addrs = self._derivatives_by_derived_from.get(address, [])
    return [self.get_target(addr) for addr in derivative_addrs]