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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 parse_pip_requirements(requirement_file_path):
 """ Parses requirements using the pip API. :param str requirement_file_path: path of the requirement file to parse. :returns list: list of requirements """

    return sorted(
        str(r.req)
        for r in parse_requirements(requirement_file_path,
                                    session=PipSession())
        if r.req
    )