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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_all_derivatives(self, address):
 """Get all targets derived directly or indirectly from the specified target. Note that the specified target itself is not returned. :API: public """

    ret = []
    direct = self.get_direct_derivatives(address)
    ret.extend(direct)
    for t in direct:
      ret.extend(self.get_all_derivatives(t.address))
    return ret