Please answer following questions along with Python code and its result. Make sure to import NLTK.

1. What is the number of noun synsets have no hyponyms? You can get all noun synsets usingwn.all_synsets('n').

from nltk.corpus import wordnet as wn

2. Write a program to find all words that occur at least fourty times in the Brown Corpus.

Hint: use FreqDist of NLTK

from nltk.corpus import brown