a y b c a b d b a d e c consider a,b,c,d,y as words on the text abow. a)What is the unigram and bigram probibilty of the text abow b) Replace words written once in the text with UNK .Add unk to the word list in the text. Remove words that occur once in the text from the word list .Calculate unigram and bigram probibilty where the word unk occurs . c) with the bigram values from question b , calculaate probibilty of two sectenses bellow b y a c a f y d (f is a new word)