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foreign and welcome back in this session we are going to learn about first and follow in details so without any further Ado lets get to learning coming to the outcome of todays session today we will observe the step-by-step derivation of the first and follow functions lets begin with the derivation of first now during the derivation of first its always a good idea to start with the last non-terminal and the reason behind that is notice this we are dealing with top-down parsers without backtracking now parsers cant really handle ambiguity except for operator precedence parser so definitely the grammar that we will be dealing with will be unambiguous thereafter L1 parcel is a top-down parser now top down parsers cant deal with left recursions if left recursions are there there is a possibility of getting into Infinite Loops therefore this grammar is supposed to be right recursive which if you notice carefully is true as well observed here the non-terminal E Dash is also the right m