A) Search for a fitting open-source dataset or document collection for analyzing the impact of stemming on an inverted index. (2 marks)

B) a) Create a Python function that applies stemming to a set of words from the chosen dataset. Provide examples before and after stemming. Discuss how stemming impacts the construction of an inverted index. (4 marks)

b) Write a Python function that calculates term frequency and document frequency for a given term in an inverted index using the selected dataset. Discuss the significance of these metrics in the context of information retrieval. (4 marks)