def get_sub_value(dictionary, aliases):
    """

    :param dictionary: a dictionary to check in for aliases
    :param aliases: list of keys to check in dictionary for value retrieval
    :return: returns value if alias found else none
    """

    if (dictionary and aliases) is not None:
        for alias in aliases:
            if alias in dictionary:
                return dictionary[alias]
        return None
    else:
        return None