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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 _find_input_dependencies(self, inputs):
 """Use the predecessor tree to find dependencies based on inputs. Returns: A list of transaction ids. """

        dependencies = []
        for address in inputs:
            dependencies.extend(
                self._predecessor_tree.find_read_predecessors(address))
        return dependencies