def extract_keys(self, string):
        "Extract keys to decryption and return the cipher-text area."
        header, cipher = string.split('\n\n', 1)
        *key, primer = map(self.repr_to_obj, header.split('\n'))
        self.key, self.primer = me.Key(tuple(key)), me.Primer(primer)
        return cipher
Extract keys to decryption and return the cipher-text area.
recipes/Python/578076_Markov/recipe-578076.py