def bad_words_getter(occurences, occurences_min=2):
    """From a dictionnary, returns in a list all keys with lower value than the minimum given in input """
    """In the context: returns all words that appears less than the minimum given"""
    bad_words = []
    for key,value in occurences.items():
        if value < occurences_min:
            bad_words.append(key)
    return bad_words