def process_sentence(sent, min_words=4):
    words = [normalize_word(word) for word in nltk.word_tokenize(sent, language='german')]
    if (len(words) >= min_words):
        return ' '.join((w for w in words if w)).strip()
    return ''
def process_sentence(sent, min_words=4):
    words = [normalize_word(word) for word in nltk.word_tokenize(sent, language='german')]
    if (len(words) >= min_words):
        return ' '.join((w for w in words if w)).strip()
    return 