def read_proof_template(filename):
    directory = os.path.join(util.templates_root(), util.PROOF_TEMPLATES)
    with open(os.path.join(directory, filename)) as data:
        return data.read().splitlines()
def proof_template_filenames():
    directory = os.path.join(util.templates_root(), util.PROOF_TEMPLATES)
    return os.listdir(directory)