def create_unique_ID(class_no, sentence_no):
    """ 
    Creates a a unique ID for our dataset in the format of 'c' + class_no + '-s' + sentence_no. 
    Eg - c0-s0, c1-s2 etc.
    """
    unique_id = 'c' + str(class_no) + '-s' + str(sentence_no)
    return unique_id