def get_diphone_wishlist(sentence_diphone_dict):
    """
    get a wishlist of diphones in dictionary with diphone as key and number of occurrences as value
    :param sentence_diphone_dict: a dictionary with sentence key and diphones in that sentence
    :return: diphone_wishlist
    """
    diphone_wishlist = {} # dictionary with diphones
    for k, v in sentence_diphone_dict.items():
        for type in v:  # making the wishlist for diphones
            if type in diphone_wishlist:
                diphone_wishlist[type] += 1
            else:
                diphone_wishlist[type] = 1
    return diphone_wishlist