Generates the length limits

def length_limits(max_length_limit, length_limit_step):
    """Generates the length limits"""
    string_len = len(str(max_length_limit))
    return [
        str(i).zfill(string_len) for i in
        xrange(
            length_limit_step,
            max_length_limit + length_limit_step - 1,
            length_limit_step
        )
    ]