def from_readable_hex(word):
    """ Convert back to valid hex characters """
    return word.replace('o', '0').replace('l', '1').replace('z', '2').replace(
        'm', '3').replace('y', '4').replace('s', '5').replace('h', '6'
        ).replace('t', '7').replace('x', '8').replace('9', 'g')
