Language Model a) What is a language model? b) If you want to estimate the probability of an isolated word, how can you estimate this probability? Do we have only one method to estimate this probability? If yes, why? If no, describe a second method and justify your answer. Which one is the best for you? c) If you want to estimate the probability of a sequence of two words (e.g., create jobs,crude oil), how can you estimate this probability? Justify your answer. d) Ann is interested to estimate the occurrence probability of the word coffee knowing that previously we have another one (e.g., black) or Prob(coffee | black), or Prob(coffee | strong)). How can you estimate this probability? Justify your answer.