w1 = random.randint(0,s.length-3)
    output = s.text[w1] + ' ' + s.text[w1+1]
    prev_bigram = [s.text[w1], s.text[w1+1]]
    for num in range(k-2):
        if ' '.join(prev_bigram) in s.trigram_dict:
            next_word = random.choice(s.trigram_dict[' '.join(prev_bigram)])
            output = output + ' ' + next_word
            prev_bigram[0] = prev_bigram[1]
            prev_bigram[1] = next_word
    return output