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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 parsestream(stream, encoding=None):
 """Parses sql statements from file-like object. :param stream: A file-like object. :param encoding: The encoding of the stream contents (optional). :returns: A generator of :class:`~sqlparse.sql.Statement` instances. """

    stack = engine.FilterStack()
    stack.enable_grouping()
    return stack.run(stream, encoding)