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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 to_sql_sequence(self, instring, schema, use_bag_semantics=False):
 """ Translate a relational algebra string into a list of SQL strings generated by a post-order traversal of the parse tree for the input string. :param instring: a relational algebra string to translate :param schema: a mapping of relation names to their attributes :param use_bag_semantics: flag for using relational algebra bag semantics :return: a list of SQL translation strings """

        root_list = self.to_syntax_tree(instring, schema)
        return [
            sql_translator.translate(root.post_order(), use_bag_semantics)
            for root in root_list
        ]